POSITRON CORP
8-K, 1999-02-05
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549




                                    FORM 8-K


                             CURRENT REPORT PURSUANT
                          TO SECTION 13 OR 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934



Date of report (Date of earliest event reported)                January 22, 1999


                              POSITRON CORPORATION
- --------------------------------------------------------------------------------
             (Exact Name of Registrant as Specified in Its Charter)

                                      Texas
- --------------------------------------------------------------------------------
                 (State or Other Jurisdiction of Incorporation)

       000-24092                                         76-0083622
- ------------------------                    ------------------------------------
(Commission File Number)                    (I.R.S. Employer Identification No.)

1304 Langham Creek Drive, Suite 310, Houston, Texas                     77048
- --------------------------------------------------------------------------------
(Address of Principal Executive Offices)                              (Zip Code)

                                 (281) 492-7100
- --------------------------------------------------------------------------------
              (Registrant's Telephone Number, Including Area Code)


- --------------------------------------------------------------------------------
          (Former Name or Former Address, if Changed Since Last Report)

<PAGE>
Item 1:  Change in Control of Registrant.

         Pursuant to a Stock Purchase  Agreement entered into between Registrant
and Imatron  Inc.,  a New Jersey  corporation  ("Imatron"),  on January 22, 1999
Imatron  acquired  9,000,000 shares of Registrant's  Common Stock,  representing
majority   ownership  of  the  outstanding  Common  Stock  of  Registrant  on  a
fully-diluted and as-if-converted  basis, except for  out-of-the-money  warrants
and options determined as of that date. As a result of the acquisition,  Imatron
now  owns  directly  63.6  %  of  the  currently  outstanding  Common  Stock  of
Registrant, and 53.9% of its currently outstanding Common Stock and Common Stock
equivalents  (consisting of Common Stock equivalents of Series A preferred Stock
and Series B Preferred Stock plus  accumulated  dividends.) The Common Stock was
purchased directly from Registrant by Imatron.

         The  consideration  for  purchase  of these  securities  is a series of
affirmative covenants by Imatron designed to recapitalize Registrant and support
its re-entry into the medical imaging market,  as well as a nominal cash payment
of  $100.00  drawn  from  working  capital.  The  covenants  include  making all
reasonable  efforts to cause the placement of a ten product order from Imatron's
distributor in Japan over a 36-month  period,  using its best efforts to arrange
for  additional  third party equity  financing for  Registrant to be contributed
over a period of 18 months, and assisting  Registrant as requested and agreed in
preparing  materials  for the  shareholders'  meeting which was held in December
1998.  In connection  with  execution of the Purchase  Agreement,  Imatron began
making working capital advances  available to Registrant  beginning in May 1998.
To date,  Imatron  has made  approximately  $600,000 of  advances  available  to
Registrant.

         As  part  of  these  transactions,  three  of  the  four  directors  of
Registrant resigned immediately preceding the shareholders' meeting in December,
1998, at which meeting the shareholders elected a single director,  and approved
an  amendment  to  Registrant's   Articles  of  Incorporation  to  increase  the
authorized  Common Stock in order to enable  Registrant to issue Common Stock to
Imatron pursuant to the terms of the Stock Purchase Agreement.

         Immediately  following the closing,  the sole director of  Registrant's
Board of Directors appointed two nominees of Imatron, S. Lewis Meyer and Gary H.
Brooks,  to  Registrant's  Board  for a total  of  three  directors.  The  Board
thereupon  held a meeting at which it elected Mr. Meyer as Chairman of the Board
of  Registrant  and Mr. Brooks as its  President,  Chief  Financial  Officer and
Secretary. In addition to their positions with Registrant,  Mr. Meyer remains as
the  Chief  Executive  Officer  of  Imatron  and Mr.  Brooks  remains  its Chief
Financial Officer.
<PAGE>
Item 7.  Financial Statements and Exhibits.

         Exhibit 1:      Stock Purchase Agreement by and between Registrant  and
Imatron (including Schedules and Exhibits).

         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.


                                                        POSITRON CORPORATION



                                                        By: /s/ GARY H. BROOKS
                                                        - - - - - - - - - - - -
                                                        Gary H. Brooks
                                                        President


                                    EXHIBIT 1
                            STOCK PURCHASE AGREEMENT
                           with Schedules and Exhibits


                        STOCK PURCHASE AGREEMENT

         This Stock  Purchase  Agreement  ("Agreement")  is made this 1st day of
May,  1998  by and  between  POSITRON  CORPORATION,  a  Texas  corporation  with
principal  offices  located at 1304 Langham  Creek Drive,  Houston,  Texas 77084
("SELLER") and IMATRON INC., a New Jersey  corporation  with  principal  offices
located at 389 Oyster Point Blvd., So. San Francisco, CA 94080 ("BUYER").

         WHEREAS, Seller wishes to issue and sell to Buyer certain shares of its
common stock ("Shares") in exchange for certain consideration; and

         WHEREAS,  Buyer wishes to purchase such certain  shares of common stock
issued by and from Seller pursuant to certain terms and conditions.

         NOW,   THEREFORE,   in   consideration  of  the  mutual  covenants  and
agreements, the Seller and Buyer hereby agree as follows:

                               AGREEMENT

         1. Sale and  Purchase of Shares.  On the  closing  date as set forth in
Section 3 ("Closing Date"), Seller shall deliver to Buyer, for the consideration
set forth in Section 2 hereof, the greater of Nine Million (9,000,000) shares of
Seller's common stock or whatever number of common shares in excess of 9,000,000
common shares constitutes fifty-one percent (51%) of Seller's outstanding voting
securities on a fully  diluted  basis,  exclusive of out of the money  warrants,
and/or  options,  and/or  convertible  securities,  calculated as of the Closing
Date.  For this purpose,  "out of the money" shall mean warrants  and/or options
and /or  convertible  securities in which the purchase  price of the  underlying
common  stock  for which the  warrant  or the  option  may be  exercised  or the
security  converted exceeds the fair market value of the underlying common stock
by more than 10%, as  determined  by  averaging  the bid and asked prices of the
common  stock during the last ten (10)  trading  days  immediately  prior to the
Closing Date.

         2. Consideration. In consideration of the purchase of the Shares on the
Closing Date, Buyer hereby agrees to pay the following consideration:

                   (a)      The affirmative covenants of Buyer as described in
Section 10 herein.

                   (b) Payment of One Hundred U.S. Dollars ($100.00), payable at
Closing.

         3.  Closing.  The closing of the sale to, and purchase by, Buyer of the
Shares  shall take place at the  offices  of Imatron  Inc.  at the hour of 10:00
a.m., on the first business day after all conditions  precedent  shall have been
met or waived, or on such other day or at such other time or place as the Seller
and Buyer shall agree.

         At the Closing, Seller will deliver to Buyer certificates  representing
the Shares being purchased by Buyer, registered in its name.

         4. Restriction on Transfer of Securities.

                   4.1. Restrictions.  The Shares are transferable only pursuant
to (a) a public offering registered under the Securities Act of 1933, as amended
(the  "Securities  Act"),  (b) Rule 144 (or any  similar  rule  then in  effect)
adopted under the Securities Act, if such rule is available,  and (c) subject to
the  conditions  elsewhere  specified  in this  Section  4,  any  other  legally
available means of transfer.

                   4.2. Each  certificate  representing  Shares will be endorsed
with the following legend:

                   (a)      Legend

                            "The   securities   evidenced   hereby  may  not  be
                  transferred without (i) the opinion of counsel satisfactory to
                  the Company that such  transfer  may be lawfully  made without
                  registration   under  the  Securities  Act  of  1933  and  all
                  applicable state securities laws or (ii) such registration."

                   (b) Stop  Transfer  Order.  A stop  transfer  order  shall be
  placed with the  Seller's  transfer  agent  preventing  transfer of any of the
  securities  referred to in paragraph  (a) above  pending  compliance  with the
  conditions set forth in any such legend.

                   4.3. Removal of Legend.  Any legend endorsed on a certificate
or  instrument  evidencing  a security  pursuant to Section 4.2 hereof  shall be
removed,  and Seller shall issue a certificate or instrument without such legend
to the holder of such  security,  (a) in accordance  with Section 4.2(a) hereof,
(b) if such  security is being  disposed of pursuant to  registration  under the
Securities  Act and any  applicable  state acts or  pursuant  to Rule 144 or any
similar  rule then in effect,  or (c) if such  holder  provides  Seller  with an
opinion  of counsel  satisfactory  to it to the  effect  that a sale,  transfer,
assignment, offer, pledge or distribution for value of such security may be made
without  registration  and that  such  legend is not  required  to  satisfy  the
applicable exemption from registration.

         5.  Representations  and Warranties by Seller.  Except as disclosed and
  described in Schedule 5 hereto, Seller represents and warrants to Buyer that:

                   5.1. Organization,  Standing,  Power. Seller is a corporation
  duly  organized,  validly  existing and in good standing under the laws of the
  State of Texas, and has the requisite corporate power and authority to own its
  properties and to carry on its business in all material  respects as it is now
  being  conducted.  Seller has, or at the Closing Date will have, the requisite
  corporate  power and  authority to issue the Common  Shares,  and to otherwise
  perform its obligations  under this  Agreement.  The copies of the Articles of
  Incorporation and Bylaws of the Company delivered to Buyer or its agents prior
  to the execution of this  Agreement  are true and complete  copies of the duly
  and legally adopted Articles of  Incorporation  and Bylaws of Seller in effect
  as of the date of this Agreement.

                   5.2. Qualification. Seller is duly qualified or licensed as a
  foreign  corporation in good standing in each jurisdiction  wherein the nature
  of  its  activities  or  of  its   properties   owned  or  leased  makes  such
  qualification  or  licensing  necessary  and  failure  to be so  qualified  or
  licensed would have a material adverse impact on its business.

                   5.3. Financial Statements.  Attached hereto as Exhibit A are:
  (a) a  balance  sheet  at  September  30,  1997,  together  with  the  related
  statements of operations  and cash flow, and changes to  shareholders'  equity
  for the 9 month  period  then  ended,  and (b) a draft of a  balance  sheet at
  December 31, 1997 (the "Balance  Sheet Date"),  and the related  statements of
  operations and cash flow for the quarter then ended,  prepared by Seller. Such
  financial statements (i) are true and correct and in accordance with the books
  and records of Seller,  (ii) present fairly the financial  condition of Seller
  at the balance sheet dates and the results of its  operations  for the periods
  therein specified,  and (iii) have, in all material respects, been prepared in
  accordance with generally  accepted  accounting  principles applied on a basis
  consistent  with prior  accounting  periods,  except that the balance sheet at
  December 31, 1997 and related  statements  of  operations  and cash flow is in
  draft form and does not  contain  footnotes.  Specifically,  but not by way of
  limitation,  the balance  sheets or notes  thereto  disclose all of the debts,
  liabilities  and  obligations  of any  nature  (whether  absolute,  accrued or
  contingent  and whether  due or to become due) of Seller at December  31, 1997
  and at the Balance Sheet Date which,  individually  or in the  aggregate,  are
  material and which in accordance with generally accepted accounting principles
  would be required to be disclosed in such balance sheets,  and the omission of
  which would, in the aggregate,  have a material adverse impact on Seller.  The
  balance  sheets  include   appropriate   reserves  for  all  taxes  and  other
  liabilities accrued at such date but not yet payable.

                   5.4.  Tax  Returns  and  Audits.   Except  as  disclosed  and
  described on Schedule 5.4 hereto,  all required  federal,  state and local tax
  returns or appropriate  extension  requests of Seller have been filed, and all
  federal,  state and local  taxes  required  to be paid  with  respect  to such
  returns have been paid or due provision for the payment thereof has been made.
  Except as disclosed and described on Schedule 5.4, Seller is not delinquent in
  the  payment  of  any  such  tax  or in  the  payment  of  any  assessment  or
  governmental  charge,  Seller has not  received  notice of any tax  deficiency
  proposed or assessed against it, and Seller has not executed any waiver of any
  statute of  limitations  on the  assessment  or collection of any tax. None of
  Seller's tax returns has been audited by governmental  authorities in a manner
  to bring such audits to the Seller's  attention.  Seller does not have any tax
  liabilities  except those  reflected in Schedule 5.4 hereto and those incurred
  in the ordinary course of business since the Balance Sheet Date.

                   5.5.   Litigation;   Governmental   Proceedings.   Except  as
  disclosed  and described on Schedule 5.5 hereto:  there are no legal  actions,
  suits, arbitrations or other legal, administrative or governmental proceedings
  or investigations  pending or, to the knowledge of Seller,  threatened against
  Seller, its properties,  assets or business;  Seller is not aware of any facts
  which are likely to result in or form the basis for any such  action,  suit or
  other proceeding; Seller is not in default with respect to any judgment, order
  or decree of any court or any governmental agency or  instrumentality;  Seller
  has not been  threatened  with any action or proceeding  under any business or
  zoning ordinance, law or regulation.

                   5.6.  Compliance with Applicable Laws and Other  Instruments.
  The business  and  operations  of Seller have been and are being  conducted in
  accordance with all applicable laws, rules and regulations of all governmental
  authorities.  Subject to shareholder approval of appropriate amendments to the
  Articles of Incorporation  as contemplated by this Agreement,  and except with
  respect to  existing  registration  rights of  holders  of certain  securities
  issued by Seller,  as disclosed  and  described on Schedule  5.6,  neither the
  execution nor delivery of, nor the  performance  of or compliance  with,  this
  Agreement nor the  consummation of the transactions  contemplated  hereby will
  conflict  with,  or,  with or without the giving of notice or passage of time,
  result in any  breach  of, or  constitute  a default  under,  or result in the
  imposition  of any lien or  encumbrance  upon any asset or  property of Seller
  pursuant to, any applicable law, administrative  regulation or judgment, order
  or decree of any court or governmental body, any agreement or other instrument
  to which Seller is a party or by which it or any of its properties,  assets or
  rights  is  bound  or   affected,   and  will  not  violate  the  Articles  of
  Incorporation or Bylaws of Seller.  Seller is not in violation of its Articles
  of Incorporation or its Bylaws.

                   5.7. Common Shares.  The Common Shares,  when issued and paid
for pursuant to the terms of this Agreement,  will be duly  authorized,  validly
issued and  outstanding,  fully  paid,  nonassessable  and free and clear of all
pledges, liens,  encumbrances and restrictions.  The Common Shares, when issued,
will contain no  undisclosed  interest,  present or future,  and Seller does not
know,  and at Closing will not know, of any  assertion of such an interest.  The
Common  Shares will be genuine,  and Seller has no  knowledge  of any fact which
would impair the validity thereof.

                   5.8.     Capital Stock.  The currently authorized capital
stock of Seller is as follows:

        SECURITY      AUTHORIZED    ISSUED    COMMON SHARE EQUIVALENT  RESERVED
Common                15,000,000   5,128,990     5,128,990
Series A Preferred     5,450,000   1,595,005     1,614,705
Series B Preferred        35,000      25,000       632,721



         All of the outstanding shares of capital stock of Seller have been duly
authorized  and validly issued and are fully paid and  nonassessable.  Except as
disclosed and  described in Schedule 5.8,  neither the offer nor the issuance or
sale of the Common  Shares as  contemplated  by this  Agreement  constitutes  an
event,  under any anti-dilution  provisions of any securities issued or issuable
by Seller or any  agreements  with  respect to the  issuance  of  securities  by
Seller,  which will either  increase the number of shares  issuable  pursuant to
such provisions or decrease the consideration per share to be received by Seller
pursuant to such  provisions.  All  outstanding  securities  of Seller have been
issued in full compliance with an exemption or exemptions from the  registration
and  prospectus  delivery  requirements  of the  Securities  Act  and  from  the
registration and  qualification  requirements of all applicable state securities
laws. Seller is not a party or subject to any agreement or understanding, and to
Seller's knowledge,  there is no agreement or understanding  between any persons
or entities or by a director of Seller,  which  affects or relates to the voting
or giving of written consents with respect to any security of Seller.

                   5.9.  Warrants,   Options,  Exchange  Rights  and  Conversion
Rights. Except as otherwise disclosed and described in Schedule 5.9 hereto or as
contemplated by this Agreement,  there are no outstanding or authorized options,
warrants,  purchase rights,  subscription  rights,  calls,  contracts,  demands,
commitments, Convertible Securities (as hereinafter defined) or other agreements
or  arrangements of any character or nature  whatever,  under which Seller is or
may be  obligated  to  issue  capital  stock  or  other  securities  of any kind
representing an ownership  interest or contingent  ownership interest in Seller.
Except as  otherwise  disclosed  and  described  in  Schedule  5.9  hereto or as
contemplated by this Agreement,  there are no voting trusts,  proxies,  or other
agreements or understandings  with respect to the voting of the capital stock of
Seller.

                   5.10. No Brokers or Finders.  No person,  firm or corporation
has or will  have,  as a result of any act or  omission  of  Seller,  any right,
interest or valid claim against or upon the Seller or Buyer for any  commission,
fee or other compensation as a finder or broker, or in any similar capacity,  in
connection with the  transactions  contemplated  by this Agreement.  Seller will
indemnify and hold Buyer harmless  against any and all liability with respect to
any  such  commission,  fee  or  other  compensation  which  may be  payable  or
determined to be payable in connection  with the  transactions  contemplated  by
this Agreement.

                   5.11.  Composition  of  the  Board  of  Directors.  As of the
Execution  Date,  the complete  Board of  Directors of Seller  consists of those
persons, including vacant positions, as set forth on Schedule 5.11.

         6.  Representations  and  Warranties  of Buyer.  Buyer  represents  and
warrants that:

                   6.1.  Investment  Intent.  The Common  Shares being  acquired
hereunder are being  purchased for Buyer's own account and not with the view to,
or for resale in connection  with, any  distribution or public offering  thereof
within the meaning of the  Securities  Act.  Buyer  understands  that the Common
Shares have not been registered under the Securities Act or any applicable state
laws by reason of their  issuance  or  contemplated  issuance  in a  transaction
exempt  from  the  registration  and  prospectus  delivery  requirements  of the
Securities  Act and such laws,  and that the  reliance of Seller and others upon
this  exemption is  predicated  in part upon this  representation  and warranty.
Buyer  further  understands  that the Common  Shares may not be  transferred  or
resold  without (a)  registration  under the  Securities  Act and any applicable
state  securities  laws,  or (b)  an  exemption  from  the  requirements  of the
Securities Act and applicable state securities laws.

                   6.2.  Accredited   Investor.   The  state  in  which  Buyer's
principal office is located is set forth in Buyer's address as set forth in this
Agreement.  Buyer qualifies as an accredited investor within the meaning of Rule
501  under the  Securities  Act.  Buyer has such  knowledge  and  experience  in
financial and business  matters that Buyer is capable of  evaluating  the merits
and risks of the investment to be made hereunder by Buyer.

                   6.3.  Acts and  Proceedings.  This  Agreement  has been  duly
authorized by all necessary  action on the part of Buyer, has been duly executed
and delivered by Buyer,  and is a valid and binding  agreement  upon the part of
Buyer.

                   6.4. No Brokers or Finders.  No person,  firm or  corporation
has or will  have,  as a result  of any act or  omission  by Buyer,  any  right,
interest  or  valid  claim  against  Seller  for any  commission,  fee or  other
compensation as a finder or broker,  or in any similar  capacity,  in connection
with the transactions  contemplated by this Agreement.  Buyer will indemnify and
hold Seller  harmless  against any and all  liability  with  respect to any such
commission,  fee or other  compensation which may be payable or determined to be
payable as a result of the actions of Buyer in connection with the  transactions
contemplated by this Agreement.

         7. Conditions of Buyer's Obligation. Buyer's obligation to purchase and
pay for the Common  Shares on the  Closing  Date is  subject to the  fulfillment
prior to or on the Closing Date of the conditions set forth below.  In the event
that any such  condition is not  satisfied to Buyer's  satisfaction,  then Buyer
shall not be obligated  to proceed  with the purchase of such Common  Shares nor
otherwise with any further of its obligations pursuant to this Agreement.

                   7.1.     No  Errors.  etc.  The  representations  and
warranties  of Seller  under  this Agreement  shall be true in all  material
respects  as of the  Closing  Date with the same effect as though made on and as
of the Closing Date.

                   7.2.  Compliance with Agreement.  Seller shall have performed
and complied in all material respects with all agreements or conditions required
by this  Agreement to be performed and complied with by it prior to or as of the
Closing Date.

                   7.3.   Qualification   Under  State   Securities   Laws.  All
registrations,  qualifications,  permits and approvals required under applicable
state  securities  laws for the lawful  execution and delivery of this Agreement
and the offer, sale,  issuance and delivery of the Common Shares shall have been
obtained.

                   7.4.  Proceedings  and  Documents.  All  corporate  and other
proceedings and actions taken in connection with the  transactions  contemplated
hereby and all  certificates,  opinions,  agreements,  instruments and documents
mentioned  herein or incident to any such  transaction  shall be satisfactory in
form and substance to Buyer and its counsel.

                   7.5.   Resignation  of  Officers  and  Appointment  of  Chief
Executive  Officer.  Seller will obtain and deliver to Buyer the resignations of
each of the officers of Seller, including but not limited to its chief executive
officer,  effective as of the Closing Date, and  simultaneously  therewith shall
cause the  appointment of a chief  executive  officer and such other officers as
are designated by Buyer.  Seller  acknowledges  that the officers'  resignations
pursuant  to this  Section  7.5  will  not  constitute  resignation  by any such
employee  from  employment by Seller,  unless  specifically  so  indicated,  and
further that such resignation  pursuant to this Section 7.5 will not be deemed a
breach of any employment  agreement  which might be in effect between Seller and
such employee.  Seller further acknowledges that delivery and acceptance of such
resignation  does not  otherwise  modify the terms of any  employment  agreement
which may be in  effect,  nor is it  intended  to  effect  Seller's  ability  to
negotiate  mutually  acceptable  changes in future to any  employment  agreement
which may be currently in effect.

                   7.6.  Special  Shareholders'   Meeting.   Promptly  following
execution of this Agreement,  Seller shall take, with the assistance of Buyer as
set forth in this  Agreement,  all such  actions as may be  necessary  and shall
cause the convening of a Special Meeting of Shareholders as promptly as possible
to  amend  the  Articles  of  Incorporation  to  authorize  an  increase  in its
authorized  common stock in such an amount as to fully effectuate the provisions
of this Agreement,  taking into account such obligations as Seller may currently
have or may be  expected  to have in the  foreseeable  future  in  light  of its
business  plan.  It is the  reasonable  expectation  of  the  parties  that  the
appropriate  number of authorized  shares  resulting from such amendment will be
not less than 100,000,000 common shares.

                   7.7.  Board  Resignations.  (a) Upon  request of Buyer at any
time between  execution of this  Agreement and the Closing Date, to be effective
upon the Closing Date,  Seller will obtain and deliver to Buyer the resignations
of at least three of the four members of its Board of Directors, as reflected on
Schedule 5.11 to this Agreement. (b) Immediately upon Closing, Seller will cause
a sufficient  number of  directors'  resignations  to be effective and thereupon
will cause the  nominees of Buyer to be elected as  directors of Seller in place
of the resigned  directors or otherwise to fill vacancies on the Board, so that,
following such action,  the nominees of Buyer will  constitute a majority of the
members of the Board then in office.

         8. Conditions of Seller's  Obligation.  Seller's obligation to sell the
Common Shares to Buyer on the Closing Date is subject to the  fulfillment  prior
to or on the Closing Date of the conditions  set forth below.  In the event that
any such  condition is not  satisfied,  Seller shall not be obligated to proceed
with the sale of such Common Shares.

                   8.1. Shareholder  Authorization.  The shareholders shall have
authorized  an  increase  in the  number of  authorized  shares of common  stock
sufficient to fully effectuate the purposes of this Agreement.

                   8.2. No Errors,  etc. The  representations  and warranties of
Buyer  under this  Agreement  shall be true in all  material  respects as of the
Closing Date with the same effect as though made on and as of the Closing Date.


                   8.3.  Compliance with Conditions.  Buyer shall have performed
and complied with all agreements or conditions  required by this Agreement to be
performed and complied with by it prior to or as of the Closing Date.

         9. Seller Affirmative Covenants. Seller covenants and agrees that:

                   9.1. Corporate Existence. Seller will maintain and cause each
Subsidiary (as hereinafter  defined) to maintain its corporate existence in good
standing  and comply  with all  applicable  laws and  regulations  of the United
States or of any state or states thereof or of any political subdivision thereof
and of any  governmental  authority  where  failure  to so comply  would  have a
material adverse impact on Seller or its business or operations.

                   9.2.  Books of Account and  Reserves.  Seller will,  and will
cause each of its  Subsidiaries  to,  keep books of record and  account in which
full,  true and  correct  entries  are made of all of its and  their  respective
dealings, business and affairs, in accordance with generally accepted accounting
principles.  Seller will employ  certified  public  accountants  selected by the
Board who are "independent" within the meaning of the accounting  regulations of
the  Commission,  and  have  annual  audits  made  by  such  independent  public
accountants   in  the  course  of  which  such   accountants   shall  make  such
examinations,  in accordance with generally accepted auditing standards, as will
enable  them to give such  reports or  opinions  with  respect to the  financial
statements of Seller and its  Subsidiaries  as will satisfy the  requirements of
the Commission in effect at such time with respect to certificates  and opinions
of accountants.

                   9.3.  Furnishing  of  Financial  Statements and Information.
Seller will deliver to Buyer:

     (a) as soon as practicable, but in any event within 45 days after the close
of each quarterly period,  unaudited  consolidated  balance sheets of Seller and
its  Subsidiaries  as of the end of  such  period,  together  with  the  related
consolidated  statements  of operations  and cash flow for such period,  setting
forth the budgeted  figures for such period prepared and submitted in connection
with  Seller's  annual  business  plan and in  comparative  form figures for the
corresponding  quarterly  period of the previous  fiscal year, all in reasonable
detail and certified by an authorized  accounting officer of Seller,  subject to
year-end adjustments;

     (b) as soon as  practicable,  but in any event within 90 days after the end
of  each  fiscal  year,  a   consolidated   balance  sheet  of  Seller  and  its
Subsidiaries,  as of the end of such  fiscal  year,  together  with the  related
consolidated  statements of operations,  shareholders'  equity and cash flow for
such fiscal year,  setting  forth in  comparative  form figures for the previous
fiscal year, all in reasonable detail and duly certified by Seller's independent
public  accountants  (except for the fiscal year ended 1997, for which certified
materials  will be supplied as soon as  practicable  following  Closing),  which
accountants  shall have given Seller an opinion,  unqualified as to the scope of
the audit, regarding such statements;

     (c) with reasonable  promptness,  such other financial data relating to the
business,  affairs and financial  condition of Seller and any Subsidiaries as is
available to Seller and as from time to time Buyer may reasonably request; and

     (d) at  least 20 days  prior to the  earlier  of (i) the  execution  of any
agreement  relating  to any  merger  or  consolidation  of  Seller or any of its
Subsidiaries  with  another  corporation,  or a plan of exchange  involving  the
outstanding  capital  stock of Seller or any of its  Subsidiaries,  or the sale,
transfer  or other  disposition  of all or  substantially  all of the  property,
assets or business of Seller or any of its Subsidiaries to another  corporation,
or (ii) the holding of any meeting of the shareholders of Seller for the purpose
of approving  such action,  written  notice of the terms and  conditions of such
proposed  merger,  consolidation,  plan of  exchange,  sale,  transfer  or other
disposition.

                   9.4.  Indemnification  Rights.  For a period of not less than
six (6) years from the Closing Date,  unless  otherwise  required by law, Seller
will  maintain  provisions  in its  articles of  incorporation  and by-laws with
respect to  indemnification  of directors and officers,  whether then current or
former,  that are no less  favorable than as currently set forth in its articles
of  incorporation  and by-laws.  Further,  for a period of not less than six (6)
years from the Closing  Date,  unless  otherwise  required  by law,  Seller will
continue to provide indemnification of its directors and officers,  whether then
current or former, to the fullest extent permissible under Texas law.

         10. Buyer's  Affirmative  Covenants.  Upon execution of this Agreement,
Buyer agrees as follows:

                   10.1.  Special  Shareholders'  Meeting.  In  connection  with
Special Shareholders' Meeting to be called pursuant to Section 7.6 herein, Buyer
agrees to  assist  Seller  as  reasonably  requested  and  agreed  in  preparing
materials and soliciting  proxies in connection  with obtaining  approval of its
shareholders to increase its  authorization  to issue common stock in connection
with  the  transaction  contemplated  by this  Agreement.  As  part  of  Buyer's
obligations  hereunder,  Buyer agrees reimburse Seller for expenses  incurred in
preparing  materials and  soliciting  proxies,  not in excess of the amounts set
forth in  Schedule  10.1,  and  further to  furnish  Seller,  within  reasonably
sufficient  time to be reviewed  and  included in the  materials to be mailed to
shareholders in connection with the Special Shareholders'  Meeting, the names of
Buyer's  nominees  for election to the Board,  together  with  information  with
respect to each nominee  equivalent to the information  required to be disclosed
to stockholders  with respect to director nominees pursuant to Regulation 14A of
the Securities and Exchange Act and such other similar  information  that Seller
may thereafter  reasonably  request.  It is understood that Seller may refuse to
cause the  nomination  and  election  as a  director  of  Seller of any  nominee
proposed by Buyer if (i) the information described above is not timely furnished
by Buyer or (ii) if, having been  furnished,  it is the  reasonable  judgment of
Seller and its counsel  that the  election of such  nominee  would not be in the
best interests of Seller or might tend to subject Seller to liability  therefor.
The foregoing notwithstanding, Buyer and Seller agree to cooperate and use their
mutual best efforts for the purpose of preparing for and  conducting the Special
Shareholders' Meeting as promptly as possible following the Execution Date.

                   10.2.  Orders for Product.  As soon as practicable  following
the Closing Date,  but not later than eight (8) months from the Execution  Date,
Buyer  will  take all  reasonable  efforts  to cause the  placement  of ten (10)
product  orders,   in  the  aggregate   including  any  orders  currently  under
discussion,  from Buyer's  affiliate in Japan over a period of  thirty-six  (36)
months from the placement of the first order.

                   10.3. Additional Equity. As soon as practicable following the
Closing Date,  Buyer will use its best efforts to arrange for  additional  third
party equity financing for Seller,  to be contributed to Seller over a period of
no greater than eighteen (18) months from the Closing Date,  and in an aggregate
amount  not  less  than  Eight  Million  U.S.  Dollars   ($8,000,000)   ("Equity
Financing").  The parties  specifically  acknowledge  and  anticipate  that this
Equity  Financing will involve  and/or cause a substantial  dilution of existing
shareholders, including but not limited to Buyer.

         11. Negative Covenants.  Seller will not, without the prior approval of
a majority  of all of the  members  of the Board of  Directors:  (a)  guarantee,
endorse or otherwise be or become contingently  liable, or permit any Subsidiary
to guarantee,  endorse or otherwise become  contingently  liable,  in connection
with the obligations,  securities or dividends of any person, firm,  association
or corporation, other than Seller or any of its Subsidiaries, except that Seller
and any  Subsidiary  may endorse  negotiable  instruments  for collection in the
ordinary course of business;  or (b) make or permit any Subsidiary to make loans
or advances to any person (including without limitation to any officer, director
or shareholder of Seller or any Subsidiary),  firm,  association or corporation,
except  loans and  advances  to Seller  and its  wholly-owned  Subsidiaries  and
advances to suppliers and employees made in the ordinary course of business;  or
(c) purchase or invest,  or permit any Subsidiary to purchase or invest,  in the
stock or  obligations  of any other person,  firm or  corporation,  other than a
wholly-owned  Subsidiary;   or  (d)  pay,  or  permit  any  Subsidiary  to  pay,
compensation,  whether by way of salaries, bonuses, participations in pension or
profit  sharing  plans,  fees under  management  contracts  or for  professional
services or fringe  benefits  to any  officer in excess of amounts  fixed by the
Board of Directors prior to any payment to such officer.

         12.  Registration  of Stock.  Subject to the  provisions of the several
registration rights agreements and /or other agreements containing  registration
rights provisions, to which Seller is a party, all as disclosed and described on
Schedule 12 hereto, Seller agrees as follows:

                   12.1. Rights to Registration.  (a) If, at any time during the
period  commencing on the effective  date of this  Agreement and ending ten (10)
years thereafter, Seller shall determine to register under the Securities Act of
1933,  as  amended,  any shares of Stock to be offered for cash by it or others,
pursuant to a  registration  statement on Form S-1 (or its  equivalent),  Seller
will (i)  promptly  give written  notice to Buyer of its  intention to file such
registration  statement  and (ii) at  Seller's  expense  (which  shall  include,
without limitation,  all registration and filing fees,  printing expenses,  fees
and  disbursements of counsel and independent  accountants for Seller,  and fees
and expenses  incident to compliance  with state  securities  law, but shall not
include  fees  and  disbursements  of  counsel  for  Buyer)  include  among  the
securities  covered by the  registration  statement  such portions of the Shares
then held by Buyer as shall be specified in a written  request to Seller  within
thirty  (30) days after the date on which  Seller gave the notice  described  in
(a)(i)  above.  (b) Upon  receipt of such  written  request and of the shares of
Stock specified in the request (any shareholder  requesting  registration  being
individually  called  a  "Selling  Shareholder"),  Seller  shall:  (i)  use  its
reasonable best efforts to effect the registration,  qualification or compliance
of the Shares under the  Securities Act and under any other  applicable  federal
law and any applicable  securities or blue sky laws of jurisdictions  within the
United States;  (ii) furnish each Selling  Shareholder  such number of copies of
the  prospectus  contained  in  the  registration   statement  filed  under  the
Securities  Act  (including  preliminary  prospectus)  in  conformity  with  the
requirements  of the  Securities  Act,  and such other  documents as the Selling
Shareholder may reasonably request in order to facilitate the disposition of the
Stock  covered by the  registration  statement;  and (iii)  notify each  Selling
Shareholders,  at any time when a  prospectus  relating to the Stock  covered by
such  registration  statement is required to be delivered  under the  Securities
Act, of the happening of any event as a result of which the prospectus forming a
part of such  registration  statement,  as then in  effect,  includes  an untrue
statement of a material  fact or omits to state any material fact required to be
stated therein or necessary to make the statements  therein not misleading,  and
at the  request of the Selling  Shareholders  prepare and furnish to the Selling
Shareholders  any reasonable  number of copies of any supplement to or amendment
of such  prospectus  as may be necessary  so that,  as  thereafter  delivered to
purchasers of the Stock,  such prospectus  shall not include an untrue statement
of a  material  fact or omit to state a  material  fact  required  to be  stated
therein or necessary to make the statements therein not misleading.

                   12.2.  Registration of Underwritten Offering. If the offering
of  securities  to  be  registered  by  Seller  is  underwritten,  each  Selling
shareholder  shall  sell  the  Stock to or  through  the  underwriter(s)  of the
securities  being  registered  for the account of Seller or others upon the same
terms  applicable  to  Seller  or  others,  and if the  managing  underwriter(s)
reasonably  determine that all or any portion of the shares of Stock held by the
Selling Shareholders should not be included in the registration statement,  then
notwithstanding  anything to the contrary in this Section,  the determination of
such  underwriter(s)  shall  be  conclusive;   provided  however  that  if  such
underwriter(s)  determine  that  some but not all of the  Stock  of the  Selling
Shareholders  shall be included  in the  registration  statement,  the number of
shares  of  Stock  owned  by each  Selling  Shareholder  to be  included  in the
registration  statement will be  proportionately  reduced in accordance with the
respective written requests given as provided above.

                   12.3.  Indemnification.  In the event that  Shares  purchased
pursuant to this Agreement are included in a registration  statement  under this
Section 11, Seller will indemnify and hold harmless each Selling Shareholder and
each other  person,  if any, who controls  such Selling  shareholder  within the
meaning  of  the  Securities  Act,  against  any  losses,   claims,  damages  or
liabilities,  joint or several, to which such Selling Shareholder or controlling
person may become subject under the Securities Act or otherwise, insofar as such
losses, claims, damages or liabilities (or actions in respect thereof) arise out
of are based  upon any  untrue  statement  or alleged  untrue  statement  of any
material fact  contained,  on the effective  date thereof,  in any  registration
statement pursuant to which the Shares were registered under the Securities Act,
any  preliminary  prospectus  or  final  prospectus  contained  therein,  or any
amendment or supplement  thereto, or arise out of or are based upon the omission
or alleged  omission  to state  therein a material  fact  required  to be stated
therein or necessary to make the statements therein not misleading, or arise out
of or are based upon the failure by Seller to file any  amendment or  supplement
thereto  that was  required  to be filed  under  the  Securities  Act,  and will
reimburse  such Selling  Shareholder  and each such  controlling  person for any
legal or any other  expenses  reasonably  incurred  by them in  connection  with
investigating or defending any such loss,  claim,  damage,  liability or action.
Notwithstanding the foregoing, Seller will not be liable in any such case to the
extent that any such loss, claim, damage, or liability arises out of or is based
upon an  untrue  statement  or  omission  made in such  registration  statement,
preliminary prospectus,  final prospectus or amendment or supplement in reliance
upon and in conformity with written  information  furnished to Seller through an
instrument duly executed by or on behalf of any Selling Shareholder specifically
for  use  in  the  preparation  of  such  registration  statement,   preliminary
prospectus, final prospectus, or amendment or supplement.

         It shall be a condition  precedent to the  obligation of Seller to take
any  action  pursuant  to this  Section  that  seller  shall  have  received  an
undertaking  satisfactory  to it from each Selling  Shareholder to indemnify and
hold harmless  Seller (in the same manner and to the same extent as set forth in
this  Section),  each  director  of  Seller,  each  officer  who shall sign such
registration statement, and any persons who control Seller within the meaning of
the  Securities  Act,  with  respect  to any  statement  or  omission  from such
registration  statement,   preliminary  prospectus,   or  any  final  prospectus
contained therein,  or any amendment or supplement thereto, if such statement or
omission was made in reliance  upon and in conformity  with written  information
furnished to Seller  through an  instrument  duly  executed by the  indemnifying
party  specifically for use in the preparation of such  registration  statement,
preliminary prospectus, final prospectus, or amendment or supplement.

         Promptly  following  receipt by an  indemnified  party of notice of the
commencement  of any action  involving a claim referred to above in this Section
11.3, such  indemnified  party will, if a claim in respect thereof is to be made
against  an  indemnifying  party,  give  written  notice  to the  latter  of the
commencement  of such  action.  In case any such  action is  brought  against an
indemnified party, the indemnifying party will be entitled to participate in and
to  assume  the  defense  thereof,  jointly  with any other  indemnifying  party
similarly  notified,  to the extent that it may wish,  with  counsel  reasonably
satisfactory to such  indemnified  party, and after notice from the indemnifying
party to such  indemnified  party of its election to assume the defense thereof,
the  indemnifying  party  will not be liable to such  indemnified  party for any
legal or other expenses  subsequently  incurred by the latter in connection with
the defense thereof.

                   12.4. Binding  provisions.  The provisions of this Section 11
shall be binding on the  successors  of Seller.  No  Shareholder  may assign the
provisions  of this  Section  11 or all or any  part of its or their  rights  or
obligations  hereunder,  except that in the event of a merger or  consolidate in
which the Seller is not the survivor,  the Seller shall assign and transfer, and
successor shall assume, the provisions of this Section 11.

                   12.5. Conflicts.  To the extent that Seller's compliance with
the  obligations  set forth in Sections  12.1 through 12.4 above would  conflict
with or  otherwise  cause a  breach  of or  default  under  any of its  existing
obligations pursuant to the agreements set forth on Schedule 12 attached hereto,
Seller's failure to comply with those  obligations  shall not be deemed a breach
of this Agreement.

         13. Remedies Cumulative,  and not Waived. (a) No right, power or remedy
conferred  upon any party  shall be  exclusive,  and each such  right,  power or
remedy  shall be  cumulative  and in  addition to every  other  right,  power or
remedy,  whether  conferred  hereby or by any such  security or now or hereafter
available  at law or in  equity or by  statute  or  otherwise.  (b) No course of
dealing  between the parties or the holder of any Shares  purchased  pursuant to
this Agreement,  and no delay in exercising any right, power or remedy conferred
hereby or by any such security or now or hereafter  existing at law or in equity
or by statute or otherwise,  shall operate as a waiver of or otherwise prejudice
any such right, power or remedy;  provided,  however, that this Section 13 shall
not be  construed  or applied so as to negate the  provisions  and intent of any
statute which is otherwise applicable.

         14.  Changes.  Waivers.  etc.  Neither this Agreement nor any provision
hereof may be changed,  waived,  discharged or terminated  orally, but only by a
statement  in  writing  signed by the party  against  which  enforcement  of the
change, waiver, discharge or termination is sought.

         15. Notices. All notices,  requests,  consents and other communications
required or permitted  hereunder shall be in writing and shall be delivered,  or
mailed  first-class  postage  prepaid,  registered  or  certified  mail,  or via
overnight  delivery  with by a service  providing  evidence  of  receipt  to the
addresses below:

                  If to Buyer:      Imatron Inc.
                                    389 Oyster Point Blvd.
                                    South San Francisco, CA 94080
                       Attn: Mr. S. Lewis Meyer, President

                                    Telephone: (415) 583-9964
                                    Facsimile: (415) 871-0418

                  Copy to:          Roger S. Mertz, Esq.
                                    Severson & Werson, P.C.
                                    One Embarcadero Center
                                    Suite 2600
                                    San Francisco, CA 94111

                                    Telephone: (415) 398-3344
                                    Facsimile: (415) 956-0439

                  If to Seller:     Positron Corporation
                                    1304 Langham Creek Drive, Suite 310
                                    Houston, Texas 77084
                                    Attn:  President

                                    Telephone: (281) 492-7100
                                    Facsimile: (281) 492-2961


                  Copy to:          Michael D. Wortley, Esq.
                                    Vinson & Elkins
                                    3700 Trammell Crow Center
                                    2001 Ross Avenue
                                    Dallas, Texas 75201

                                    Telephone: (214) 220-7700
                                    Facsimile: (214) 999-7732

and such  notices  and  other  communications  shall  for all  purposes  of this
Agreement  be  treated as being  effective  or having  been  given if  delivered
personally,  or, if sent by first class mail,  three days after  posting,  or if
sent via  overnight  delivery,  when  received as  evidenced  by an  appropriate
receipt.

         16.   Survival   of   Representations   and   Warranties,    etc.   All
representations and warranties  contained herein shall survive the execution and
delivery of this Agreement,  any  investigation  at any time made by Buyer or on
its behalf,  and the sale and  purchase  of the Common  Shares.  All  statements
contained in any  certificate,  instrument or other  writing  delivered by or on
behalf of Seller pursuant hereto or in connection with or  contemplation  of the
transactions  herein  contemplated  (other than legal opinions) shall constitute
representations  and warranties by Seller  hereunder,  and not by the individual
officer  who signed the  certificate,  instrument  or writing by or on behalf of
Seller.

         17. Parties in Interest. All the terms and provisions of this Agreement
shall be  binding  upon and inure to the  benefit of and be  enforceable  by the
respective successors and assigns of the parties hereto, whether so expressed or
not, and, in particular, shall inure to the benefit of and be enforceable by the
holder or holders at the time of any of the Common Shares.  The former,  current
and hereafter  appointed officers and directors  referenced in Section 9.4 above
are intended and deemed to be third party  beneficiaries of Section 9.4, and are
entitled to enforce its provisions.

         18.  Headings.  The  headings of the Sections  and  paragraphs  of this
Agreement  have been  inserted  for  convenience  of  reference  only and do not
constitute a part of this Agreement.

         19.  Choice of Law. It is the intention of the parties that the laws of
California shall govern the validity of this Agreement,  the construction of its
terms and the interpretation of the rights and duties of the parties.

         20. Counterparts. This Agreement may be executed concurrently in two or
more counterparts,  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

         21.  Severability.  In the  event  that any part of this  Agreement  is
determined by a court of competent jurisdiction to be unenforceable, the balance
of the Agreement shall remain in full force and effect.

         IN WITNESS  WHEROF,  the parties  execute this Agreement as of the date
first written above.

SELLER:                                 BUYER:
POSITRON CORPORATION                    IMATRON INC.



By: /s/ Gary B. Wood                    By: /s/ S. Lewis Meyer
Its: Chief Executive Officer            Its:  President/CEO


ATTEST:                                 ATTEST:



By: /s/ Howard R. Baker                 By: /s/ Gary H. Brooks
Its: Executive Vice President           Its:  CFO


<PAGE>


                               EXHIBIT A

                         FINANCIAL STATEMENTS

      [9/30/97 10Q previously filed with SEC by Positron not reprinted here]



<PAGE>


                                    SCHEDULES

                              DISCLOSURE SCHEDULES
                                       TO
                        STOCK PURCHASE AGREEMENT BETWEEN
                              POSITRON CORPORATION
                                       AND
                                  IMATRON INC.



<PAGE>



                              POSITRON CORPORATION

                      Schedule 5.4--Tax Returns and Audits

Except as disclosed and described,  all federal,  state and local tax returns or
appropriate  extension  requests have been filed;  all federal,  state and local
taxes have been paid or due provision made;  there are no  delinquencies  in the
payment  of such  tax or  assessment  or  governmental  charge;  no  notices  of
deficiencies proposed or assessed has been received; Seller has not executed any
waiver of any statute of  limitations on assessment or collection of any tax; no
tax returns have been audited; there are no tax liabilities, except as follows:

          1.  Property  taxes in the  approximate  amount of $185,000,  of which
approximately $80,000 relates to prior years.

          2. State sales taxes in the State of Texas in the  approximate  amount
of $4,000.

          3. State sales taxes to the State of Florida in the approximate amount
of $12,000.

          4.  State  sales  taxes to the  State  of New York in the  approximate
amount of $56,000.





<PAGE>



                              POSITRON CORPORATION

              Schedule 5.5--Litigation or Governmental Proceedings

Except  as  disclosed  and  described,   there  are  no  legal  actions,  suits,
arbitration,  or other legal,  administrative  or  governmental  proceedings  or
investigations  pending  or  threatened;  Seller is aware of no facts  likely to
result in or form a basis for such action; Seller is not in default with respect
to any  judgment,  order or  decree  or any  court  or  governmental  agency  or
instrumentality;  Seller is not threatened with any action or proceeding  except
as follows:

 1. We have been  informed  that Xin Xin  intends  to proceed  with  arbitration
relative to its  contract  with  Positron  Corporation  for the  purchase of two
POSICAM systems.

 2. Numerous  letters have been received from vendors  threatening  legal action
against the Company for its failure to pay outstanding trade payables.

 3. The loan from ProFutures  Bridge Capital is in default due to the failure of
the  Company to pay the full  $50,000 per month due on the loan.  The  Company's
payments  have  averaged   approximately  $45,000  per  month.   ProFutures  has
threatened legal action.

 4. All former and existing  employees who are owed unpaid  salaries,  wages and
benefits  have a claim  against the Company.  The amounts due could be collected
through legal action or by the Texas Workforce Commission.

 5. Hadassah  Medical  Organization  has threatened  legal action if the Company
does not immediately  replace its existing POSICAM system with a new system.  To
date no formal legal action has been filed.

 6.  University  Madrid  PET  Center  has also  threatened  legal  action if its
existing POSICAM is not upgraded to a newer machine that meets its expectations.

 7. Nizar  Mullani,  a former  director of the  Company,  claims that he is owed
consulting fees and royalties of  approximately  $150,000.  The Company disputes
the amount of royalty  actually owed to Mullani.  Mullani has  threatened  legal
action. To date no formal action has been taken by Mr. Mullani.

 8. Harris County, Texas has been awarded a default judgment against the Company
for its failure to pay property taxes in the approximate amount of $80,000.

 9. Bowne of Dallas, Inc. received a default judgment against the Company in the
amount of $31,277.05.

 10. Boxer Property  (Landlord) has issued a notice for Positron  Corporation to
vacate remaining  space.  Agreement has been reached for Positron to consolidate
its space and relocate to another facility as soon as possible.



<PAGE>



                              POSITRON CORPORATION

            Schedule 5.6--Compliance With Laws and Other Instruments

Disclosure of any existing  registration rights of holders of certain securities
issued by Seller.  Further,  except as disclosed and  described,  the execution,
delivery and performance of the transactions  contemplated by the Agreement will
not conflict with, result in a breach of, constitute, agreement or instrument to
which  Seller  is a party or by which it or any of its  properties  or assets is
bound, nor violate its Articles or Bylaws, except as follows:

 A.       93 Registration Rights

          A.       Covers "Registrable Securities" consisting of:

                   (i)     353,531 shares of Common Stock issued upon
                           conversion of the Series E  Preferred Stock;

                   (ii)    Warrants  issued in the 93  Placement  and  shares of
                           Common Stock  issuable  upon exercise of the Warrants
                           (the Warrants are currently  exercisable  for 527,743
                           shares of Common Stock at $5.51 per share);

                           Upon the registration of the Warrants  pursuant to an
                           exercise of a demand  right or piggyback  right,  the
                           terms  and  provisions  of  such  Warrants  are to be
                           amended to be identical or substantially identical to
                           the terms and  provisions  as then  existing  for the
                           Redeemable Warrants.

          B.       Demand Rights:

                   (i)     exercisable by 30% of holders of Registrable
                           Securities (calculated assuming exercise of
                           Warrants);

                   (ii) have 2 demand rights exercisable as follows:

                            a.      one demand right is exercisable commencing
                                    day 180 (measured from the
                                    effective date) and ending day 270;

                            b.      The  second  demand  right  is   exercisable
                                    commencing  day 271 and  ending 5 years from
                                    the effective  date,  if exercised  prior to
                                    the second anniversary of the effective date
                                    and  not  as a  part  of a  firm  commitment
                                    underwriting,  unless waived by  Josephthal,
                                    Lyon & Ross, such demand right is limited to
                                    the offering during any 90-day period of:

                                     1.      200,000 shares of Common Stock

                                     2.      Warrants exercisable for 200,000
                             shares of Common Stock

                                     3.      200,000 shares of Common Stock
                                             issuable upon the exercise of
                            the registered Warrants.

                            c.      Unless  waived by JL&R,  the  demand  rights
                                    individually  or in the aggregate may not be
                                    exercised  prior to day 390 in a  manner  to
                                    exceed:

                                     1.      325,000 shares of Common Stock

                                     2.      Warrants exercisable for 325,000
                             shares of Common Stock

                                     3.      325,000 shares of Common Stock
                                             issuable upon the exercise of
                             the registered warrants

          C.       Piggyback Rights:

                   (i) Have 3 piggyback rights that become exercisable after
day 390.

 B.       General Registration Rights

          A.      Covers  Common Stock held by certain  shareholders  other than
                  Common Stock received as a part of the 93 Placement.

          B.       Demand Rights

                   (i)   exercisable by 30% of the holders of "Registrable
                         Securities"

                   (ii) Have 2 demand rights exercisable as follows:

                            a.  The demand rights are exercisable commencing
                                day 570 and ending the 5th anniversary of the
                                effective date;

          C.       Piggyback Rights

                   (i)      Have 3 piggyback rights

                   (ii)    Cut back provisions give priority to the Underwriter,
                           the Company and then to the 93 registration rights if
                           the 93 holders are exercising a demand right.

          D.       Overall Restriction

                   (i)     Unless  waived by JL&R any exercise of a demand right
                           or piggyback  right prior to the 2nd  anniversary  of
                           the  effective  date  and  not  as a  part  of a firm
                           commitment  underwriting  is limited to the  offering
                           during any 90-day period of 200,000  shares of Common
                           Stock.

 C.       Other Registration Rights

          A.       One holders has piggyback rights for 977 shares of Common
                   Stock.

Note:  The Underwriter warrants from the IPO were exchanged for
 Series A Preferred Stock.



<PAGE>



                              POSITRON CORPORATION

                           Schedule 5.8--Capital Stock

Except as  disclosed  and  described,  neither the offer nor issuance or sale of
additional   stock  as   contemplated   will   constitute  an  event  under  any
anti-dilution  provisions of any securities issued or issuable or any agreements
with  respect to issuance  of Seller  which will  increase  the number of shares
issuable  pursuant to such provisions or decrease the consideration per share to
be received  by the  Seller,  except as  described  in  Footnotes 6 and 7 to the
Company's Annual Report on Form 10 KSB for the Year Ended December 31, 1996.

See attached capital structure.



<PAGE>



Section 5.8 requirements:
- --------------------- ------------ ------------ -------------- ---------------
                                     COMMON
 SECURITY              AUTHORIZED     ISSUED      EQUIVALENT      RESERVED
- --------------------- ------------ ------------ -------------- ---------------
- --------------------- ------------ ------------ -------------- ---------------

Common Stock           15,000,000    5,128,990    5,128,990       9,871,010
- --------------------- ------------ ------------ -------------- ---------------
- --------------------- ------------ ------------ -------------- ---------------
Series A Preferred
Stock                  5,450,000     1,595,005    1,595,005
- --------------------- ------------ ------------ ------------- ----------------
- --------------------- ------------ ------------ ------------- ----------------
Series B Preferred
Stock                     25,000        25,000      625,000
- --------------------- ------------ ------------ ------------- ----------------



<PAGE>



                              POSITRON CORPORATION

     Schedule 5.9--Warrants, Options, Exchange Rights and Conversion Rights

Except as  disclosed  and  described,  there are no  outstanding  or  authorized
options,  warrants,  purchase rights,  subscription  rights,  calls,  contracts,
demands,  or  commitments,   convertible  securities,  or  other  agreements  or
arrangements under which Seller may be obligated to issue capital stock or other
securities.  Further,  except as disclosed  and  described,  there are no voting
trusts, proxies or other agreements or understandings with respect to the voting
of Seller's  capital  stock,  except as  described  in  Footnotes 6 and 7 to the
Company's Annual Report on Form 10 KSB for the Year Ended December 31, 1996.

See attached "Capital Structure, as of January 31, 1998."



<PAGE>

                               Capital Structure
                             as of January 31, 1998

                                                 Pre-Imatron       Post-Imatron

Common stock                                      5,128,990          5,128,990

Series A Preferred stock              (A)         1,703,258          2,917,197

Series B Preferred stock              (G)           667,415          1,113,825

Preferred stock dividends             (C)           203,000                  0

Shares issued to Imatron              (L)                           12,000,000

ProFutures warrants                               1,500,000          2,503,242

Shares issued in private placement                        0                  0
                                                 ----------        -----------

Total "in-the-money" shares                       9,202,663         23,663,254
                                                  ---------         ----------

                                      (F)           635,276            635,276

Stock options

Series A Preferred stock warrants     (B)         1,621,940          2,696,042

Series B Preferred stock warrants     (H)           105,955            176,105

                                      (J)            67,500             67,500

UroTech warrant

BF&E warrant                          (K)            45,000             45,000

Redeemable warrants                   (D)         5,737,573         10,038,228

1993 warrants                         (E)           527,743            923,318
                                                -----------         ----------

Total "out-of-the-money" shares
                                                  8,740,987         14,581,469
                                                -----------         ----------

Total shares                                     17,943,650         38,244,723
                                                -----------         ----------

If all "out-of-the-money" shares exercise approximately $38,900,000 will come to
the Company.




<PAGE>



                              POSITRON CORPORATION

                                    Footnotes

 A.      Series A Convertible Preferred Stock converts into common stock one for
         one. Dividends are payable  semi-annually at 8%. Initially  convertible
         at $1.33 per share; $1.31 after giving effect to the Series A Preferred
         Stock dividends;  $.86 after giving effect to the issuance of shares to
         Imatron;  $.75 after  giving  effect to the issuance of shares at $.50;
         and, $.68 after giving effect to the issuance of shares at $.375.

 B.      Series A Preferred  Stock warrants,  convertible  into common stock one
         for one at $1.33 per share initially; $1.29 after ratcheting effect for
         shares issued to Imatron;  $1.04 after  ratcheting to give effect to $8
         million  raised at $.50 per share;  and, $.94 after  ratcheting to give
         effect to $8 million raised at $.375 per share.

 C.     Series A Preferred Stock dividends  accumulated dividends since issuance
        of preferred stock.

 D.      Prior to  issuance  of shares to  Imatron  at $.01 per share the strike
         price  of  the  warrant  is  $5.51;   subsequent  to  issuance  of  the
         aforementioned  shares the strike price is $3.61 per share. $2.48 after
         ratcheting to give effect to $8 million raised at $.50 per share;  and,
         $2.21 after ratcheting to give effect to $8 million raised at $.375 per
         share. Expire 12/3/98.

 E.      1993 warrants have same provisions as the Redeemable Warrants.

 F. Employees' stock options generally exercisable at $2.65 per option.

 G.      Series B Convertible Preferred Stock converts into common stock one for
         one.  Initially  convertible  at $1.33 per share;  $1.31  after  giving
         effect to the Series A Preferred  Stock  dividends;  $.86 after  giving
         effect to the issuance of shares to Imatron;  $.75 after giving  effect
         to the issuance of shares at $.50, and, $.68 after giving effect to the
         issuance of shares at $.375.

 H.      Series B Preferred  Stock warrants,  convertible  into common stock one
         for one at $1.33 per share initially; $1.29 after ratcheting effect for
         shares issued to Imatron;  $1.04 after  ratcheting to give effect to $8
         million  raised at $.50 per share;  and, $.94 after  ratcheting to give
         effect to $8 million raised at $.375 per share.

 I.      Ten-year warrants expiring in 2006, exercisable 200,000 at $2.40 and
         100,000 at $1.91.

 J.      Uro-Tech warrants exercisable at $2.00 until 2/7/00.

 K. BF&E warrants exercisable at $2.00 until 2/7/00.

 L. Shares issued to give Imatron at least 51% control.



<PAGE>



                                  SCHEDULE 5.9

              Warrants, Options, Exchange and/or Conversion Rights

Except as  disclosed  and  described,  there are no  outstanding  or  authorized
options,  warrants,  purchase  rights,  subscription  rights,  calls,  contract,
demands,  or  commitments,   convertible  securities,  or  other  agreements  or
arrangements under which Seller may be obligated to issue capital stock or other
securities.  Further,  except as disclosed  and  described,  there are no voting
trusts, proxies or other agreements or understandings with respect to the voting
of Seller's capital stock.

                                                  Rate of       Adjusted Price
                   Number                      Conversion (if     Following
Security         Outstanding   Exercise Price    applicable)     Transaction
- --------         -----------   --------------  --------------   --------------

Series A         -----------   --------------  --------------   --------------

Series B         -----------   --------------  --------------   --------------

Series A
Warrants         -----------   --------------  --------------   --------------

Series B
Warrants         -----------   --------------  --------------   --------------

1987 Employee
SOP              -----------   --------------  --------------   --------------

1994 Employee
SOP              -----------   --------------  --------------   --------------

1993 Warrants    -----------   --------------  --------------   --------------

Redeemable
Warrants         -----------   --------------  --------------   --------------

UroTech
Warrants         -----------   --------------  --------------   --------------

Boston
Financial
Warrants         -----------   --------------  --------------   --------------

ProFutures
Warrants         -----------   --------------  --------------   --------------

K. Lance Gould   -----------   --------------  --------------   --------------

Gary Wood        -----------   --------------  --------------   --------------


<PAGE>



                              POSITRON CORPORATION

                        Schedule 5.11--Board of Directors


      Name                    Age             Position
      ----                    ---             --------

Gary B. Wood, Ph.D.           47         Director and Chairman of the Board

K. Lance Gould, M.D.          57         Director

John H. Laragh, M.D.          69         Director

Ronald B. Schilling, Ph.D.    56         Director



<PAGE>



                                  Schedule 10.1

                                       to

                            Stock Purchase Agreement

In connection  with the Special  Shareholders'  Meeting to be called pursuant to
Section 7.6,  Buyer will  reimburse  Seller for  expenses  incurred in preparing
materials and soliciting proxies up to $50,000.



<PAGE>



                                   Schedule 12

Provisions of  registration  rights  agreements or other  agreements  containing
registration rights provisions to which Seller is a party.





                                See Schedule 5.6





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