As filed with the Securities and Exchange Commission on November 21, 2005

                                                       Registration No._________


                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    Form S-3
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                               THERMOGENESIS CORP.
             (Exact name of registrant as specified in its charter)

          Delaware                                       94-3018487
          --------                                       ----------
(State or other jurisdiction of                       (I.R.S. Employer
 incorporation or organization)                      Identification No.)


                                2711 Citrus Road
                            Rancho Cordova, CA 95742
                                 (916) 858-5100
          (Address and telephone number of principal executive offices)

                                Philip H. Coelho
                             Chief Executive Officer
                                2711 Citrus Road
                            Rancho Cordova, CA 95742
                                 (916) 858-5100
            (Name, address and telephone number of agent for service)

                                   Copies to:
                              David C. Adams, Esq.
                                 Mark Lee, Esq.
                          Bullivant/Houser/Bailey P.C.
                         1331 Garden Highway, Suite 300
                          Sacramento, California 95833
                            Telephone: (916) 442-0400

Approximate date of commencement of the proposed sale to the public: From time
to time after the effective date of this Registration Statement.

If the only securities being registered on this Form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box. [ ]

If any of the securities being registered on this Form are to be offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]




If this Form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the Securities Act, please check the following box and list
the  Securities  Act  registration  statement  number of the  earlier  effective
registration statement for the same offering. [ ]

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under
the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]

If delivery of the Prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]


                         

                                                CALCULATION OF REGISTRATION FEE
========================================= ================= ================ =================== ===================
                                                               Proposed
                                                                maximum       Proposed maximum
  Title of each class of securities to      Amount to be    offering price       aggregate           Amount of
             be registered                registered(1)(3)   per share(2)    offering price(2)    registration fee
========================================= ================= ================ =================== ===================

========================================= ================= ================ =================== ===================
Common Stock, $0.001 par value               $75,000,000            -            $75,000,000          $8,827.50
========================================= ================= ================ =================== ===================


(1) There are being registered an indeterminate number of shares of common stock
of the Registrant as shall have an aggregate offering price not to exceed
$75,000,000. The proposed maximum offering price per share shall be determined
from time to time by the Registrant in connection with the issuance of any
securities under the registration statement. Also includes additional shares of
common stock that may be issued as a result of stock splits, stock dividends or
similar transactions.
(2) Calculated in accordance with Rule 457(o) of the Securities Act of 1933, as
amended ("Securities Act"). 
(3)  Includes  such  indeterminate  number of shares of common stock as may from
time to  time be  issued  at  indeterminate  prices,  subject  to the  aggregate
threshold dollar amount registered.

The registrant hereby amends this registration statement on such date or dates
as may be necessary to delay its effective date until the registrant shall file
a further amendment which specifically states that this registration statement
shall thereafter become effective in accordance with Section 8(a) of the
Securities Act or until the registration statement shall become effective on
such date as the Securities and Exchange Commission (the "Commission"), acting
pursuant to said Section 8(a), may determine.






The information in this prospectus is not complete and may be changed. The
Company may not sell these securities until the registration statement filed
with the Commission becomes effective, and only then pursuant to a prospectus
supplement. This prospectus is not an offer to sell these securities and we are
not soliciting an offer to buy these securities in any state where the offer or
sale is not permitted or would be unlawful prior to registration or
qualification under the securities laws of any such state.

                 SUBJECT TO COMPLETION, DATED NOVEMBER 21, 2005.

                                   PROSPECTUS

                                   $75,000,000

                               THERMOGENESIS CORP.
                                  Common Stock
                           --------------------------

     By this prospectus,  we may offer a number of shares of our common stock up
to an  aggregate of  $75,000,000  in one or more  transactions.  We will provide
specific terms for any sale of common stock in  supplements to this  prospectus.
You should read this  prospectus and any prospectus  supplement,  as well as the
documents  incorporated  or  deemed  to be  incorporated  by  reference  in this
prospectus,  carefully  before you invest.  This  prospectus  may not be used to
offer and sell the shares of common  stock  unless  accompanied  by a prospectus
supplement.

     Our common stock is traded and listed on the NASDAQ SmallCap Market,  under
the symbol  "KOOL." On November 18, 2005,  the last  reported sale price for the
common stock was $5.01 per share. 

                         -------------------------------

          INVESTING IN OUR COMMON STOCK INVOLVES A HIGH DEGREE OF RISK.
                          SEE "RISK FACTORS" AT PAGE 2.

                         -------------------------------

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

THIS PROSPECTUS MAY NOT BE USED TO CONSUMMATE SALES OF SECURITIES UNLESS
ACCOMPANIED BY THE APPLICABLE PROSPECTUS SUPPLEMENT.

                The date of this Prospectus is _______________, 2005





Table of Contents

                                                                            Page

Prospectus Summary.............................................................1
Our Business...................................................................3
Risk Factors...................................................................3
Use of Proceeds................................................................3
Business Description...........................................................4
Description of Common Stock....................................................9
Plan of Distribution..........................................................10
Indemnification of Directors and Officers.....................................10
Experts.......................................................................11
Legal Matters.................................................................11

                               PROSPECTUS SUMMARY

Forward-Looking Statements

     This  Prospectus  contains or  incorporates  "forward-looking  statements,"
which include statements about our business strategy,  our growth strategy,  our
product  development  and  marketing  efforts  and  anticipated  trends  in  our
business,   which  are  not  historical  facts.  We  may  also  make  additional
forward-looking  statements  from time to time in filings  that we make with the
Commission. When we use words like "believe," "expect," "anticipate," "project,"
and  similar   expressions,   this  should  alert  you  that  the  statement  is
forward-looking.  Forward-looking  statements  speak  only as of the date  made,
based largely on expectations.  These  expectations  are generally  subject to a
number  of  risks  and  uncertainties,  some of which  cannot  be  predicted  or
quantified  and which are beyond our control.  Future events and actual  results
may differ materially from the anticipated  results  expressed in,  contemplated
by, or underlying our forward-looking statements. Statements in this Prospectus,
and in documents incorporated by reference into this Prospectus, including those
set forth in the caption "Risk Factors"  describe  factors,  among others,  that
could  contribute  to  or  cause  differences.  In  light  of  these  risks  and
uncertainties,   we  cannot  give  any  assurances   that  the   forward-looking
information will in fact transpire or prove to be accurate in the future.

Summary

     This summary highlights selected  information from this prospectus and does
not contain all of the  information  that is important to you. To understand the
terms  of any  offering  you  should  read  carefully  this  prospectus  and the
prospectus supplement, as well as our periodic reports filed with the Securities
and Exchange Commission that contain more detailed disclosure about our business
and financial performance.

                                       1


About this Prospectus

This  prospectus is part of a  registration  statement on Form S-3 that we filed
with  the  Securities  and  Exchange  Commission  ("SEC")  utilizing  a  "shelf"
registration process.  Under this shelf registration process, we may sell shares
of our common stock up to an aggregate of $75,000,000 in one or more  offerings.
This prospectus  provides you with a general description of the shares of common
stock we may offer.  Each time we sell shares of common  stock we will provide a
prospectus  supplement that will contain specific information about the terms of
that  offer  and  sale.  The  prospectus  supplement  may add,  update or change
information  contained  in  this  prospectus.  This  prospectus,  together  with
applicable prospectus supplements, includes all material information relating to
this offering.  Please  carefully  read both this  prospectus and any prospectus
supplement together with any additional information described below under "Where
You Can Find More  Information." THIS PROSPECTUS MAY NOT BE USED TO CONSUMMATE A
SALE OF SECURITIES UNLESS IT IS ACCOMPANIED BY A PROSPECTUS SUPPLEMENT.

Where You Can Find More Information

     Government Filings. We file annual, quarterly and special reports and other
information with the Commission. You may read and copy any document that we file
at the  Securities  and Exchange  Commission's  Public  Reference Room at 100 F.
Street, N.E., Room 1580,  Washington,  D.C. 20549. Please call the Commission at
1-202-551-8090 for more information about the Public Reference Room. Most of our
filings are also  available to you free of charge at the Securities and Exchange
Commission's website at http://www.sec.gov.

     Information Incorporated by Reference. The Commission rules and regulations
allow us to  "incorporate  by reference" the  information  that we file with it.
This means  that we can  disclose  additional  important  information  to you by
referring to those  documents.  The information  incorporated by reference is an
important part of this  Prospectus,  and information  that we file in the future
with the Commission will automatically update and supersede this information. We
have filed the  following  documents  with the  Commission  and the  information
contained in those documents is incorporated by reference into this Prospectus:

o    Our  Annual  Report on Form 10-K for the fiscal  year ended June 30,  2005,
     filed on September 12, 2005;

o    Our Quarterly Report on Form 10-Q for the quarter ended September 30, 2005,
     filed on November 9, 2005;

o    Our Current Reports on Form 8-K filed on November 10, 2005;

o    Our Current Report on Form 8-K filed on October 18, 2005;

o    Our Proxy Statement on Schedule 14A filed on September 12, 2005;

                                       2


o    Our Proxy Statement on Schedule 14A filed on October 31, 2005.

     Please  note that all other  documents  and reports  filed  under  Sections
13(a),  13(c),  14 or 15(d)  of the  Securities  and  Exchange  Act of 1934,  as
amended,  following the date of this  Prospectus and prior to the termination of
this  offering  will  be  deemed  to be  incorporated  by  reference  into  this
Prospectus  and  will be made a part of it from  the  date of  filing  with  the
Commission.

     Filings  made with the  Commission  and other  information  about us can be
found on our website at  www.thermogenesis.com.  We will provide to each person,
including any beneficial owner, who is delivered a prospectus,  a copy of any of
the documents that are  incorporated by reference free of charge.  Send requests
to Matthew Plavan,  Assistant  Corporate  Secretary,  ThermoGenesis  Corp., 2711
Citrus Road, Rancho Cordova, CA 95742 or call (916) 858-5100.

Our Business

     We are a leader in developing and manufacturing  automated blood processing
systems and disposables that enable the  manufacture,  preservation and delivery
of personalized cell and tissue therapy products, or CTT products,  for clinical
use.  Personalized CTT products are created from the blood or tissue of a single
donor and  administered  to that donor or a matched  patient.  Our  systems  and
disposables  are intended  for use by hospitals  and blood banks in two distinct
markets.  In cell  therapy,  our products  automate the  isolation,  capture and
preservation  of stem cells  residing in the blood of the placenta and umbilical
cord,  or cord  blood,  after a baby is  born.  These  cells  are  used to treat
patients  for  leukemia,  lymphoma  and over 60 other life  threatening  genetic
diseases. Cord blood stem cells typically result in reduced immune complications
post transplant compared to adult bone marrow stem cells. In tissue therapy, our
products are used for the rapid  manufacture of autologous  sealants or thrombin
for surgical wound care.  Autologous  sealants have no risk of  contamination by
blood-borne  pathogens  from  other  donors.  We  believe  that our  significant
experience and technical  expertise in developing  proprietary  technologies for
enabling personalized CTT products,  coupled with our relationships with leading
transplant  physicians,  stem cell  researchers and surgeons,  has enabled us to
develop safer, more effective systems for these applications.

     Our  principal  executive  offices are located at 2711 Citrus Road,  Rancho
Cordova, California 95742. Our telephone number is (916) 858-5100.

                                  RISK FACTORS

     Investment in our common stock involves risk. You should carefully consider
the risks we describe  in our reports  filed with the  Securities  and  Exchange
Commission (SEC) from time to time which are  incorporated by reference  herein,
and those that may be set forth in any prospectus supplement, before deciding to
invest.

                                 USE OF PROCEEDS

     Unless  otherwise  indicated in the applicable  prospectus  supplement,  we
expect to use the net  proceeds  from the sale of our common  stock for  working
capital,  to fund our  future  growth  plans,  and for other  general  corporate

                                       3


purposes  and  capital  expenditures  related to our  growth.  We may also use a
portion of the net  proceeds  to acquire or invest in  businesses,  products  or
technologies that complement our existing business. From time to time, we engage
in preliminary  discussions and negotiations with various businesses in order to
explore the possibility of strategic partnering or investment.

                           DESCRIPTION OF OUR BUSINESS

BUSINESS OVERVIEW

     We are a leader in developing and manufacturing  automated blood processing
systems and disposables that enable the  manufacture,  preservation and delivery
of personalized cell and tissue therapy products, or CTT products,  for clinical
use.  Personalized CTT products are created from the blood or tissue of a single
donor and  administered  to that donor or a matched  patient.  Our  systems  and
disposables  are intended  for use by hospitals  and blood banks in two distinct
markets.  In cell  therapy,  our products  automate the  isolation,  capture and
preservation  of stem cells  residing in the blood of the placenta and umbilical
cord,  or cord  blood,  after a baby is  born.  These  cells  are  used to treat
patients  for  leukemia,  lymphoma  and over 60 other life  threatening  genetic
diseases. Cord blood stem cells typically result in reduced immune complications
post transplant compared to adult bone marrow stem cells. In tissue therapy, our
products are used for the rapid  manufacture of autologous  sealants or thrombin
for surgical wound care.  Autologous  sealants have no risk of  contamination by
blood-borne  pathogens  from  other  donors.  We  believe  that our  significant
experience and technical  expertise in developing  proprietary  technologies for
enabling personalized CTT products,  coupled with our relationships with leading
transplant  physicians,  stem cell  researchers and surgeons,  has enabled us to
develop safer, more effective systems for these applications.

     In recent years, our revenue  primarily has been generated from the sale of
our  BioArchive  System and  related  disposables.  However,  we  currently  are
developing and commercializing new automated systems that enable the manufacture
of  personalized  CTT  products.  Our products and products in  development  are
described below.

o         The BioArchive  System is an automated  cryogenic  system used in cell
          therapy to  cryopreserve  and archive cord blood stem cells for future
          transplant.  We have sold 117 BioArchive Systems to date to major cord
          blood banks and stem cell research institutes in 26 countries. We have
          recently  signed a global  distribution  agreement  with GE Healthcare
          granting them exclusive rights to distribute the BioArchive System and
          related disposables.

o         The AutoXpress, or AXP, System is our newly developed automated system
          and disposable intended for use in cell therapy to isolate and capture
          stem cells from cord blood.  Our  agreement  with GE  Healthcare  also
          grants  them  exclusive  rights  to  distribute  the  AXP  System  and
          disposables,  and we  expect  sales to begin in the first  quarter  of
          2006.

o         The CryoSeal Fibrin Sealant, or FS, System is an automated system used
          in wound care to prepare an  autologous  hemostatic  surgical  sealant
          from

                                       4


          a patient's own blood in approximately one hour. We have completed our
          pivotal 150 patient  U.S.  clinical  trial and are  preparing  our PMA
          submission.  In addition,  we have received the CE Mark,  and in Japan
          our distribution partner, Asahi Medical, filed their PMA equivalent in
          March 2005.

o        The Thrombin Processing Disposable, or TPD, is used in wound care to
         isolate activated thrombin from the patient's blood plasma in less than
         30 minutes. Thrombin is used as a topical hemostatic agent for minor
         bleeding sites, to treat pseudo aneurysms and to release growth factors
         from platelets. We have signed non-exclusive distribution agreements
         with Biomet, Medtronic and Asahi Medical for sales of our TPD.

BACKGROUND

Industry

     CTT is a broad and rapidly  growing  field of medicine  that  requires  the
collection,  purification,  manipulation,  storage  and  administration  of stem
cells, proteins and growth factors tailored to individual patients. Personalized
CTT  products  are  created  from  the  blood  or  tissue  of  a  single  donor,
administered  to that  donor  or a  matched  patient,  and used  either  for the
treatment of leukemia,  lymphoma and over 60 other life threatening diseases, or
for surgical wound care.  Critical factors in providing  effective  personalized
CTT products are that they be precisely identified and tracked from their source
to the receiving patient and that every  manufacturing step, such as harvesting,
processing,  freezing,  transporting,  matching and  delivering,  preserves  the
viability and sterility of the product.

Cell Therapy

     The human body is  comprised  of cells of specific  tissues,  such as skin,
liver or blood, and stem cells that are not fully  differentiated  into specific
tissues. Until the middle of the 1990s, researchers were familiar with two major
types of stem  cells,  embryonic  stem  cells and  adult  stem  cells.  However,
researchers now know that pluripotent  stem cells are found in cord blood,  bone
marrow and other  tissues  of the body.  Pluripotent  stem cells are  capable of
differentiation into multiple tissues such as bone, blood, nerve and muscle. All
the cells  residing in blood,  which are red cells,  white cells and  platelets,
arise from a  particular  pluripotent  stem cell called the  hematopoietic  stem
cell.  Before the  discovery  that there were  hematopoietic  stem cells in cord
blood,  the placenta and umbilical cord were  routinely  discarded as biological
waste. However,  these hematopoietic stem cells are harvested at no risk or pain
to the donor and can be  preserved  in a cord blood bank for clinical use with a
matched patient on short notice.  Their use also results in a lower incidence of
post-transplant  immune  complications  than  transplants with adult bone marrow
stem cells.

         Hematopoietic stem cell therapy is used to:

o        replace diseased bone marrow with healthy, functioning bone marrow for
         patients with blood diseases such as aplastic anemia;

                                       5


o        replace bone marrow damaged by high-dose chemotherapy or radiation
         therapy used to treat patients with a variety of cancers such as
         leukemia and lymphoma; and

o        provide genetically healthy and functioning bone marrow to treat
         patients with genetic diseases such as sickle cell anemia. 

     With approximately four million births per year in the United States alone,
cord blood  represents a large,  natural  resource  for use in the  treatment of
malignant  and  genetic  diseases.  Following  the first  successful  cord blood
transplant  performed in 1988,  awareness of the potential  therapeutic value of
cord  blood  stem cells has  increased  and  collection  and  storage  has grown
rapidly.

     We believe the number of units stored will continue to grow, due in part to
the following factors:

o        increased awareness about the availability and benefits of preserving 
         cord blood;

o        improved  technology to harvest the stem cells in a sterile environment
         and maintain their viability for many years;

o        growing endorsement by the medical community;

o        new applications for cell therapy; and

o        new governmental legislation.

     For example, in May 2005, the House of Representatives  passed the National
Cord Blood Stem Cell Act,  which aims to store  150,000 units of cord blood in a
national  registry.  This Act is still awaiting passage by the Senate, and there
is no certainty that it ultimately will pass and be signed into law. Separately,
the Health Resources and Services  Administration intends to distribute funds to
qualified  cord blood banks to  manufacture  higher quality cord blood units and
develop an improved system for  distributing the units to matched  patients.  We
believe that countries outside the United States are likely to follow this lead.

Wound Care

     Wound  care  products  are used in a variety  of  surgical  procedures  and
applications to control  bleeding,  close incisions,  assist in tissue fixation,
create a physical  barrier to prevent fluid or air passage and promote  healing.
With the population and number of surgeries  increasing and as physicians  learn
about new  applications  and safer  products,  this  market  has  potential  for
significant  growth.  Wound-healing  products  are  evaluated  by their  safety,
effectiveness,  preparation  time,  ease  of use  and  cost.  In  addition,  the
components of wound care  products are very  important,  as different  materials
have different associated risks and benefits.

     Current wound care products  fall into the  following  general  categories:
topical hemostats, tissue sealants and platelet gels. Topical hemostats are used
when  bleeding  is  difficult  to control  with  conventional  methods,  such as

                                       6


suturing,  stapling or placement of pads or gauze at the bleeding site. The most
common type of topical hemostatic agents are  thrombin-based,  which are used in
procedures  where  blood  clotting  must be  accelerated,  in  order to keep the
surgery site dry. In addition,  thrombin can be used by itself to control  minor
bleeding sites but is insufficient for more persistent bleeding sites.

     The only  thrombin  that is available in the United States as a stand-alone
product is Thrombin JMI(R), a thrombin derived from bovine,  or cow, blood. This
product is only sold in limited  geographies  outside of the United States.  The
market for thrombin is growing  rapidly,  with  Thrombin JMI net sales  totaling
approximately $175 million in the full year ended December 31, 2004, and already
$170 million during the nine months ended September 30, 2005.

     Tissue sealants,  which are more powerful  hemostatic  agents than thrombin
alone,  are made of either  biologic  or  synthetic  material  and are used in a
variety  of  surgical  specialties  and  applications.  They  are  used to close
incisions,  seal and secure skin flaps, reduce adhesions and promote hemostasis.
Fibrin sealants make up the majority of this  sub-segment.  Conventional  fibrin
sealants are derived  from large pools of up to 10,000 units of purchased  human
plasma and often contain animal proteins such as bovine aprotinin. While current
processes attempt to remove all viral and bacterial  pathogens from conventional
sealants,  there have been several recent  peer-reviewed  journal reports of the
transmission  of  Parvovirus  B-19  to  surgical  patients  treated  with  these
sealants.  In  addition,  animal  proteins  are a potential  source of agents of
transmissible  bovine  spongiform  encephalopathy,  which are  resistant  to any
methods of pathogen inactivation available to fractionators at this time.

     Autologous  platelet gels are made by isolating the platelets  from a small
amount of the patient's own blood and combining  those  platelets with thrombin.
Thrombin  causes the release of growth  factors from the  platelets,  which then
trigger wound-healing and tissue repair. Platelet gels increase the quantity and
concentration of growth factors at the wound site.

OUR SOLUTION

     We believe that the use of  personalized  CTT products will increase due to
the growing evidence and  understanding  of their clinical  benefits in treating
disease.  Our  proprietary  systems  and  disposables  enable  the  manufacture,
preservation   and  delivery  of  these   personalized  CTT  products  and  have
substantial  advantages over other products and practices  available  today. Our
products  address a broad range of CTT  applications in two primary areas:  cell
therapy and tissue therapy, including wound care.

Cell Therapy

     Our BioArchive and AXP Systems and  disposables are designed to ensure that
the stem cells in the CTT  products  are  successfully  isolated,  captured  and
preserved such that the cells are fully viable at time of transplant,  which may
be months or years after production.  The BioArchive System,  which can store up
to 3,623 units of cord blood stem cells, is the only fully automated system that

                                       7


integrates controlled rate freezing, quarantine and long term cryogenic storage.
The  robotic  storage  and  retrieval  of these  stem cell units  improves  cell
viability,  provides precise inventory  management and minimizes the possibility
of human error. To date we have sold 117 BioArchive  Systems to major cord blood
stem cell banks and stem cell research centers in 26 countries.  Cord blood stem
cell units  have been used to treat  leukemia,  lymphoma  and over 60 other life
threatening genetic diseases.

     More  recently,  we have  developed  the AXP System,  which  automates  the
isolation and capture of  hematopoietic  stem cells from cord blood into a fixed
20 ml volume.  It includes a compact  battery  powered  device and a proprietary
sterile disposable bag set. The AXP replaces the current clinical process, which
involves more than a dozen manual steps.  The AXP System will provide cord blood
banks  with a  reproducible  and  GMP-compliant  solution  to more  successfully
isolate and capture stem cells with lower labor costs and reduced contamination.
We expect sales of the AXP System and  disposables to begin in the first quarter
of 2006 through our distribution partner, GE Healthcare.

Wound Care

     In the tissue therapy market,  we have developed the CryoSeal FS System and
the TPD.  The  CryoSeal FS System  manufactures  fibrin  sealant in a closed and
sterile  disposable  from a single unit of the  patient's own plasma in about an
hour. In contrast,  conventional fibrin sealants are sourced from large pools of
up to  10,000  or more  units of  purchased  plasma  and  often  include  bovine
proteins,  and thus remain  vulnerable to contamination by infectious  pathogens
residing  anywhere in these  sources.  Our  CryoSeal FS System  prepares the two
interactive  liquid  components  of a  fibrin  sealant:  (1) the  wound  healing
proteins of fibrinogen,  fibronectin,  Factor VIII, von  Willebrands  Factor and
Factor  XIII and (2) the  activating  enzyme,  thrombin.  When  combined  at the
bleeding wound site, the two components form an adhesive gel that stops bleeding
and bonds  tissue.  Once  prepared,  the CryoSeal  fibrin  sealant may be stored
frozen for up to a year or used  immediately as a hemostatic  agent for patients
undergoing surgery.

     Our pivotal  trial,  completed  in July 2005,  was a 150  patient  blinded,
randomized  multi-center clinical trial comparing the performance of CryoSeal FS
to Johnson & Johnson's  Instat(R)  collagen sponge.  The study demonstrated that
patients treated with CryoSeal FS showed statistically  significant reduced time
to  hemostasis  versus  the  Instat(R)  control  group,  with  p=<0.001.  We are
currently  preparing  our PMA for the CryoSeal FS System for  submission  in the
first quarter of 2006.

     We have received the CE Mark,  allowing  sales of the CryoSeal FS System in
Europe,  although  sales into  individual  countries  under  cost  reimbursement
structures often requires the existence of supporting clinical usage within that
country.  We have,  through  our  distribution  partners  in Europe,  undertaken
several  clinical  studies and, upon  completion,  will initiate more aggressive
marketing. In Japan, our distributor, Asahi Medical, has completed enrollment in
their pivotal  clinical  trial and filed their PMA  equivalent in March 2005. In
addition,  several field trials are underway in other  geographies  to provide a
cost justification for reimbursement for use of the product.

                                       8



     The TPD is  incorporated  in the  CryoSeal  FS system  but can be sold as a
stand alone  product.  It is a  disposable  device that  isolates  and  captures
activated  autologous thrombin from approximately 11 ml of patient blood plasma.
Thrombin is used as a topical  hemostatic  agent for minor  bleeding  sites,  to
treat pseudo  aneurysms and to release growth factors from platelets.  We have a
received the CE Mark for TPD and began selling the product in Europe through our
distributor in August 2005. The TPD standalone  product would require a separate
PMA before sale in the United States.

OUR STRATEGY

     We believe our products  significantly  enhance the safety and viability of
CTT products and will  ultimately  expand the use and success of CTT products in
clinical  treatment.  Our strategy is to expand our  leadership  position in the
area of medical devices and disposables for the manufacture and  preservation of
personalized CTT products. The key elements of our strategy include:

o    Begin  commercializing  the AXP system  through our strategic  partner,  GE
     Healthcare Complete the PMA and receive approval for our CryoSeal FS System
     in the United States and Japan

o    Expand  commercialization  of the  TPD  through  Biomet,  Medtronic,  Asahi
     Medical and potentially other distribution partners

o    Expand our reach  through both sales and  consulting  services for clinical
     trials

o    Accelerate our research and development efforts

o    Leverage our installed base to generate additional recurring revenue

CORPORATE INFORMATION

     We are  incorporated  in  Delaware.  Our  principal  executive  offices are
located at 2711 Citrus Road,  Rancho Cordova,  California  95742.  Our telephone
number is (916)  858-5100.  Our  website is  www.thermogenesis.com.  Information
contained on our website is not considered to be a part of this prospectus.

                           DESCRIPTION OF COMMON STOCK

     We are  authorized  by our  Certificate  of  Incorporation,  as amended and
restated,  to issue  60,000,000  shares of common  stock,  $0.001  par value and
2,000,000 shares of preferred stock,  $0.001 par value. As of November 18, 2005,
there were  45,981,192  shares of common stock and no shares of preferred  stock
outstanding. Holders of shares of common stock have full voting rights, one vote
for each share held of record. Stockholders are entitled to receive dividends as
may be declared by the Board out of funds legally available  therefore and share
pro rata in any  distributions to stockholders  upon  liquidation.  Stockholders
have no conversion, preemptive or subscription rights. All outstanding shares of
common  stock are fully  paid and  nonassessable,  and all the  shares of common
stock issued by us upon the exercise of outstanding  warrants will, when issued,
be fully paid and nonassessable.

                                       9



                              PLAN OF DISTRIBUTION

     We may sell all or a portion of the common stock:

o    Through one or more underwriters or dealers for public offering and sale;

o    Directly to investors;

o    Through agents;

o    Through a block  trade in which the broker or dealer  engaged to handle the
     block  trade  will  attempt  to sell the  common  stock as  agent,  but may
     position and resell a portion of the block as principal to  facilitate  the
     transaction.

     We may  distribute  the  common  stock  from  time  to  time in one or more
transactions at a fixed price or prices, which may be changed from time to time:

o    at market prices prevailing at the time of sale, or

o    at negotiated prices.

     We will  describe  the method of  distribution  of the common  stock in the
prospectus supplement.  Underwriters, dealers or agents may receive compensation
in the form of discounts,  concessions or commissions from us or the purchasers,
as  their  agents,  in  connection  with  the sale of the  common  stock.  These
underwriters,  dealers or agents may be considered to be underwriters  under the
Securities Act of 1933, as amended, and, therefore, any discounts,  commissions,
or  profits  on  resale  received  by  such   underwriters  may  be  treated  as
underwriting discounts and commissions.  In the prospectus  supplement,  we will
identify any such  underwriter,  dealer or agent,  and describe the compensation
received  by them  from us.  Any  public  offering  price and any  discounts  or
concessions  allowed or reallowed or paid to dealers may be changed from time to
time.

     Underwriters,  dealers and agents may be entitled to  indemnification by us
against  certain  civil   liabilities,   including   liabilities  under  federal
securities  laws.  Underwriters,  dealers  and agents  also may be  entitled  to
contribution  with respect to payments made by other  underwriters,  dealers and
agents under agreements between us and such underwriters, dealers and agents.

                    INDEMNIFICATION OF DIRECTORS AND OFFICERS

     Our Amended and Restated Certificate of Incorporation provides that we will
indemnify our directors and officers to the fullest extent permitted by the laws
of the state of Delaware. Further, our bylaws, as amended, provide authority for
us to  maintain a liability  insurance  policy that  insures  our  directors  or
officers against any liability incurred by them for service to us.

                                       10


     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted for our directors, officers and controlling persons pursuant to
the foregoing provisions, or otherwise, we have been advised that in the opinion
of the Commission such  indemnification is against public policy as expressed in
the Securities Act and is, therefore,  unenforceable.  In the event that a claim
for  indemnification  against such liabilities  (other than the payment by us of
expenses incurred or paid by a director,  officer,  or controlling person of our
company in the successful defense of any action, suit or proceeding) is asserted
by  such  director,  officer  or  controlling  person  in  connection  with  the
securities being  registered,  unless in the opinion of our counsel,  the matter
has  been  settled  by  controlling  precedent,  we will  submit  to a court  of
appropriate jurisdiction the question of whether such indemnification is against
public policy as expressed in the  Securities  Act and will be governed by final
adjudication.

                                     EXPERT

     The financial  statements of ThermoGenesis  Corp appearing in ThermoGenesis
Corp.'s  Annual  Report (Form 10-K) for the year ended June 30, 2005  (including
the schedule appearing therein) and ThermoGenesis Corp.  management's assessment
of the effectiveness of internal control over financial reporting as of June 30,
2005  included  therein,  have been  audited by Ernst & Young  LLP,  independent
registered  public  accounting  firm,  as set  forth in their  reports  thereon,
included  therein,   and  incorporated  herein  by  reference.   Such  financial
statements and management's  assessment are incorporated  herein by reference in
reliance  upon such  reports  given on the  authority of such firm as experts in
accounting and auditing.

                                  LEGAL MATTERS

     The  validity of the shares of common  stock  offered will be passed by the
law firm of Bullivant/Houser/Bailey P.C., Sacramento, California.

                                       11




                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.  Other Expenses of Issuance and Distribution.

     The  following  table  sets forth the costs and  expenses  payable by us in
connection with the issuance and distribution of the securities being registered
hereunder.  No expenses shall be borne by the selling  stockholders.  All of the
amounts shown are estimates,  except for the SEC  registration  fee and the NASD
fee.

SEC registration fee                                                   $8,827.50
Printing and engraving expenses                                               $0
Accounting fees and expenses                                          $20,000.00
Legal fees and expenses                                               $25,000.00
Transfer agent and registrar fees                                             $0
Fees and expenses for qualification under state securities laws               $0
Engineering fees                                                              $0
Federal taxes                                                                 $0
State taxes                                                                   $0
Miscellaneous                                                                 $0

            Total                                                     $53,827.50
                                                                      ----------

Item 15.  Indemnification of Directors and Officers

     The Company is incorporated  in Delaware.  Under Section 145 of the General
Corporation Law of the State of Delaware,  a Delaware  corporation has the power
to  indemnify  its  directors,  officers,  employees  and agents  from  expenses
(including  attorney's fees),  judgments,  fines, and amounts paid in settlement
actually and reasonably  incurred in connection with a threatened,  pending,  or
completed action, suit or proceeding,  whether civil, criminal,  administrative,
or  investigative,  in which such  person is involved by reason of the fact such
person were or are  directors,  officers,  employees  or agents of the  Company,
provided  that such person  acted in good faith and in a manner that such person
reasonably  believed to be in the best interests of the corporation  and, in the
case of a criminal  proceeding,  such person had no reasonable  cause to believe
his or her  conduct was  unlawful.  Such  person may not be  indemnified  if the
person has been adjudged  liable to the  corporation in the  performance of such
person's duties to the corporation, unless the Court of Chancery or the court in
which  such  action  or  suit  was  brought  determines  that,  in  view  of the
circumstances  of the case,  such  person is fairly and  reasonably  entitled to
indemnity.  To the extent that such person has been  successful on the merits or

                                       12


otherwise in defense of any proceeding,  the General  Corporate Law of the State
of Delaware  provides  that such person shall be  indemnified  against  expenses
(including attorney's fees) reasonably and actually incurred. The Certificate of
Incorporation  and the By-laws of the Company  provide  for  indemnification  of
directors  and  officers  to  the  fullest  extent   permitted  by  the  General
Corporation Law of the State of Delaware.

     The  General  Corporation  Law of the  State of  Delaware  provides  that a
certificate of  incorporation  may contain a provision  eliminating the personal
liability  of a director to the  corporation  or its  stockholders  for monetary
damages for breach of fiduciary duty as a director  provided that such provision
shall not  eliminate or limit the  liability of a director (i) for any breach of
the director's duty of loyalty to the corporation or its stockholders,  (ii) for
acts or omissions not in good faith or which involve intentional misconduct or a
knowing  violation  of law,  (iii) for  unlawful  payment of  dividends or stock
redemption,  or (iv) for any  transaction  from  which the  director  derived an
improper personal benefit. The Company's  Certificate of Incorporation  contains
such a provision.

     We have  indemnification  agreements  with our  officers  and  directors to
indemnify and provide  advanced legal  expenses as permitted by applicable  law,
our Certificate of Incorporation and Bylaws.  Under the agreements,  we will not
indemnify or provide  advance  payments (i) for a violation of Section 16 of the
Securities  Exchange  Act,  (ii) in  connection  with an officer's or director's
takeover  attempt,  or (iii)  any  other  action  where  indemnification  is not
permitted by law. The agreement  terminates  when the officer or director leaves
or is removed from his position.

Item 16. Exhibits

Exhibit No.                       Description
-----------                       -----------
   5.1        Opinion of Bullivant/Houser/Bailey P.C.
  23.1        Consent of Ernst & Young, LLP
  23.2        Consent of Bullivant/Houser/Bailey P.C. (contained in Exhibit 5.1)

Item 17. Undertakings

(a) The undersigned registrant hereby undertakes

     (1) To file,  during any period in which  offers or sales are being made, a
     post-effective amendment to this registration statement:

     (i)  To  include  any  prospectus  required  by  section  10(a)(3)  of  the
          Securities Act of 1933;

     (ii) To reflect in the  prospectus  any facts or events  arising  after the
          effective  date of the  registration  statement  (or the  most  recent
          post-effective  amendment  thereof)  which,  individually  or  in  the

                                       13


          aggregate, represent a fundamental change in the information set forth
          in the  registration  statement.  Notwithstanding  the foregoing,  any
          increase  or decrease  in volume of  securities  offered (if the total
          dollar  value of  securities  offered  would not exceed that which was
          registered)  and  any  deviation  from  the  low  or  high  end of the
          estimated  maximum  offering  range  may be  reflected  in the form of
          prospectus  filed with the  Commission  pursuant to Rule 424(b) if, in
          the aggregate,  the changes in volume and price represent no more than
          a 20% change in the maximum aggregate  offering price set forth in the
          "Calculation of Registration Fee" table in the effective  registration
          statement;

     (iii) To  include  any  material  information  with  respect to the plan of
          distribution not previously  disclosed in this registration  statement
          or any  material  change  to  such  information  in  the  registration
          statement.

     (2) That, for the purpose of determining any liability under the Securities
     Act of 1933, each such post-effective amendment shall be deemed to be a new
     registration  statement relating to the securities offered therein, and the
     offering of such  securities at that time shall be deemed to be the initial
     bona fide offering thereof.

     (3) To remove from registration by means of a post-effective  amendment any
     of the securities  being  registered which remain unsold at the termination
     of the offering.

     (4) That, for the purpose of determining liability under the Securities Act
     of 1933 to any purchaser:

          (A) Each prospectus filed by the registrant pursuant to Rule 424(b)(3)
     shall be deemed to be part of the registration statement as of the date the
     filed  prospectus  was  deemed  part of and  included  in the  registration
     statement; and

          (B) Each  prospectus  required to be filed pursuant to Rule 424(b)(2),
     (b)(5),  or  (b)(7)(2),  (b)(5),  or (b)(7) of this  chapter)  as part of a
     registration  statement  in reliance  on Rule 430B  relating to an offering
     made pursuant to Rule  415(a)(1)(i),  (vii),  or (x) (i),  (vii), or (x) of
     this  chapter) for the purpose of  providing  the  information  required by
     section 10(a) of the  Securities  Act of 1933 shall be deemed to be part of
     and  included in the  registration  statement as of the earlier of the date
     such form of  prospectus is first used after  effectiveness  or the date of
     the first  contract of sale of securities in the offering  described in the
     prospectus.  As provided in Rule 430B, for liability purposes of the issuer
     and any  person  that is at that date an  underwriter,  such date  shall be
     deemed to be a new effective date of the registration statement relating to
     the  securities  in the  registration  statement  to which that  prospectus
     relates,  and the offering of such  securities at that time shall be deemed
     to be the initial bona fide offering thereof.  Provided,  however,  that no
     statement made in registration

                                       14


     statement or prospectus that is part of the registration  statement or made
     in a document  incorporated  or deemed  incorporated  by reference into the
     registration  statement  or  prospectus  that is  part of the  registration
     statement  will, as to a purchaser with a time of contract of sale prior to
     such effective date, supersede or modify any statement that was made in the
     registration  statement  or  prospectus  that was part of the  registration
     statement or made in any such document  immediately prior to such effective
     date.

     (5) That, for the purpose of determining  liability of the registrant under
     the Securities Act of 1933 to any purchaser in the initial  distribution of
     the securities:

          The undersigned  registrant  undertakes that in a primary  offering of
     securities  of the  undersigned  registrant  pursuant to this  registration
     statement,   regardless  of  the  underwriting  method  used  to  sell  the
     securities to the purchaser,  if the securities are offered or sold to such
     purchaser by means of any of the following communications,  the undersigned
     registrant  will be a seller to the  purchaser  and will be  considered  to
     offer or sell such securities to such purchaser:

          (i)  Any  preliminary  prospectus  or  prospectus  of the  undersigned
     registrant  relating to the offering  required to be filed pursuant to Rule
     424 (ss.230.424 of this chapter);

          (ii) Any free writing prospectus  relating to the offering prepared by
     or on behalf of the  undersigned  registrant  or used or referred to by the
     undersigned registrant;

          (iii) The portion of any other free writing prospectus relating to the
     offering containing material  information about the undersigned  registrant
     or its securities  provided by or on behalf of the undersigned  registrant;
     and

          (iv) Any other  communication that is an offer in the offering made by
     the undersigned registrant to the purchaser.

                                    * * * * *

(b) The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to section 13(a) or section 15(d) of the
Securities Exchange of 1934 Act that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered herein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

                                    * * * * *

(c) The undersigned registrant hereby undertakes to deliver or cause to be
delivered with the prospectus, to each person to whom the prospectus is sent or
given, the latest annual report to security holders that is incorporated by

                                       15


reference in the prospectus and furnished pursuant to and meeting the
requirements of Rule 14a-3 or Rule 14c-3 under the Securities Exchange Act of
1934; and, where interim financial information required to be presented by
Article 3 of Regulation S-X are not set forth in the prospectus, to deliver, or
cause to be delivered to each person to whom the prospectus is sent or given,
the latest quarterly report that is specifically incorporated by reference in
the prospectus to provide such interim financial information.

                                    * * * * *

(d) Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the registrant of expenses incurred
or paid by a director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.

(e) The undersigned registrant hereby undertakes that:

(1) For purposes of determining any liability under the Securities Act of 1933,
the information omitted from the form of prospectus filed as part of this
registration statement in reliance upon Rule 430A and contained in a form of
prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4) or 497(h)
under the Securities Act shall be deemed to be part of this registration
statement as of the time it was declared effective.

(2) For the purposes of determining any liability under the Securities Act of
1933, each post-effective amendment that contains a form of prospectus shall be
deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.


                                       16




                                   SIGNATURES

     Pursuant to the  requirements of the Securities Act of 1933, the registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  this  Form  S-3 and  duly  caused  this  registration
statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in Rancho Cordova, California, on November 18, 2005.

                               THERMOGENESIS CORP.
                               a Delaware Corporation

                               /s/ Philip H. Coelho
                               ---------------------------
                               Philip H. Coelho,
                               Chief Executive Officer
                               (Principal Executive Officer)

     Known All  Persons  By These  Present,  that each  person  whose  signature
appears below appoints  Thomas A. Lacey as his true and lawful  attorney-in-fact
and agent,  with full power of substitution,  for him and in his name, place and
stead,  to sign any  amendment  (including  post-effective  amendments)  to this
registration  statement,  and to file the same, with all exhibits  thereto,  and
other  documents  in  connection  therewith,  with the  Securities  and Exchange
Commission,  granting  unto said  attorney-in-fact  and  agent,  full  power and
authority to do and perform each and every act and thing requisite and necessary
to be done in connection  therewith,  as fully to all intents and purposes as he
may do in person, hereby ratifying and confirming all that said attorney-in-fact
and agent or any of them, or of his substitutes,  may lawfully do or cause to be
done by virtue hereof.

     Pursuant  to  the   requirements  of  the  Securities  Act  of  1933,  this
registration  statement  has been signed below by the  following  persons in the
capacities and on the dates indicated:

/s/ Philip H. Coelho                                  Dated:  November 18, 2005
---------------------------------------------
Philip H. Coelho,
Chairman and Chief Executive Officer
(Principal Executive Officer)

/s/ Matthew Plavan                                    Dated:  November 18, 2005
---------------------------------------------
Matthew Plavan, Chief Financial Officer
(Principal Accounting Officer and
Principal Financial Officer)

/s/ Kevin Simpson                                     Dated:  November 18, 2005
--------------------------------------------
Kevin Simpson, President,
Chief Operating Officer and Director


                                       17




/s/ Hubert E. Huckel                                  Dated:  November 18, 2005
--------------------------------------------
Hubert E. Huckel, Director


/s/ Patrick McEnany                                   Dated:  November 18, 2005
--------------------------------------------
Patrick McEnany, Director


/s/ George Barry                                      Dated:  November 18, 2005
--------------------------------------------
George Barry, Director

                                       18




                                  EXHIBIT INDEX


Exhibit No.                       Description
----------                        -----------

   5.1        Opinion of Bullivant/Houser/Bailey
  23.1        Consent of Ernst & Young, LLP
  23.2        Consent of Bullivant/Houser/Bailey (contained in Exhibit 5.1)