ADVANCED DETECTORS INC
SC 13D/A, 1996-08-05
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934

                          (Amendment No. 14)
                          --------------------



                        Advanced Detectors, Inc.
              -----------------------------------------------------
                                (Name of Issuer)

                       Common Stock, $.001 par value
            --------------------------------------------------------
                         (Title of Class of Securities)

                                007977101
           ----------------------------------------------------------
                                 (CUSIP Number)

                Nadine Shaoul, D.H. Blair Investment Banking Corp.
                44 Wall Street, New York, NY  10005 (212) 495-4163
         ------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                 Authorized to Receive Notices and Communications)

                             July 31, 1996
          -----------------------------------------------------------
            (Date of Event which Requires FIling of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b) (3) or (4), check the following box [ ].


Check the following box if a fee is being paid with this statement [ ].(A fee is
not required only if the reporting person:  (1) has a previous statement on file
reporting  beneficial  ownership  of more  than  five  percent  of the  class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)

Note: Six copies of this statement, including all exhibits, should be filed
with the Commission.  See Rule 13d-1(a) for other parties to whom copies are
to be sent.


*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).


                             Page 1 of 14 pages



<PAGE>

CUSIP No.  007977101                 13D                 Page 2 of 14 Pages



- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       J. Morton Davis


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- -------------------------------------------------------------------------------
   4   Source of Funds

       See Item #3 herein.

- -------------------------------------------------------------------------------
   5   Check Box if Disclosure of Legal Proceedings is required pursuant to
       Items 2(d) or 2(e)


- -------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

       United States

- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES            2,034,621
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH               161,820
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH             2,034,621
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER
                         161,820
- --------------------------------------------------------------------------------
   11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      2,312,201
- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                       
- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    54.4%
- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                    IN

- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

CUSIP No.  007977101                 13D           Page 3 of 14 Pages



- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       D.H. Blair Investment Banking Corp.


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- -------------------------------------------------------------------------------
   4   Source of Funds

       See Item #3 herein.

- -------------------------------------------------------------------------------
   5   Check Box if Disclosure of Legal Proceedings is required pursuant to
       Items 2(d) or 2(e)


- -------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

       New York

- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES            0
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH             2,034,621
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH             0
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER
                       2,034,621
- --------------------------------------------------------------------------------
   11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      2,034,621
- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*


- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    48.3%
- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                    BD

- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

CUSIP No.  007977101                 13D           Page 4 of 14 Pages



- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       Rosalind Davidowitz


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- -------------------------------------------------------------------------------
   4   Source of Funds

       See Item #3 herein.

- -------------------------------------------------------------------------------
   5   Check Box if Disclosure of Legal Proceedings is required pursuant to
       Items 2(d) or 2(e)


- -------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

       New York

- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES            115,760
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH             161,820
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH             115,760
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER
                       161,820
- --------------------------------------------------------------------------------
   11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                       277,850
- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*


- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    7.9%
- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                    IN

- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT
<PAGE>
                                                          Page 5 of 14 Pages

          J. Morton Davis,  D. H. Blair  Investment  Banking Corp.  ("Blair
          Investment"),  and Rosalind Davidowitz  (collectively,  the "Reporting
          Parties")  hereby  amend the  following  items in their  statement  on
          Schedule 13D relating to the common stock,  $.001 par value ("shares")
          of Advanced Detectors, Inc. (the "Issuer") as follows:

Item 3. is hereby amended by adding the following new paragraph thereto:

          This  amendment  relates  to a Warrant  to  Purchase  Common  Stock of
          Advanced  Detectors,  Inc. (the  "Warrant)  issued  pursuant to a Loan
          Agreement  (the  "Loan  Agreement")  described  in  Item  6. on page 6
          herein,  whereby Blair Investment loaned $200,000 of its general funds
          to the Issuer and was concurrently granted the Warrant.


Item 4. is hereby  partially  amended by deleting the first sentence thereto and
substituting the following sentence at the beginning of Item 4.:

          This Amendment is filed solely to report the  acquisition of a Warrant
          to  purchase  200,000  shares  described  in Item 5.  (c)  herein  for
          investment purposes only.

Item 5. (a) is hereby amended in its entirety as follows:

          As of July 31,  1996,  Mr.  Davis may be deemed  to  beneficially  own
          2,312,201   shares  or  54.4%  of  the  Issuer's   shares  issued  and
          outstanding as follows:  (i) 1,308,885  shares owned directly by Blair
          Investment,   (ii)  150,000  warrants  (4)  owned  directly  by  Blair
          Investment,   (iii)  25,736  warrants  (5)  owned  directly  by  Blair
          Investment,  (iv) a  Warrant  (6) to  purchase  350,000  shares  owned
          directly by Blair  Investment,  (v) a Warrant (7) to purchase 200,000
          shares owned  directly by Blair  Investment,  (vi) 75,900 shares owned
          directly by Parliament  Hill  Corporation (8), (vii) 48,500 shares and
          37,420   warrants  (9)  owned  directly  by  Parliament  Hill  Capital
          Corporation, and (viii)  115,760  shares  directly  owned by  Rosalind
          Davidowitz (10).

          As of July 31, 1996,  Blair  Investment may be deemed to  beneficially
          own 2,034,621  shares or 48.3% of the Issuer's  shares as indicated in
          (i) - (v) above.

          As  of  July 31,  1996,  Rosalind  Davidowitz  may  be  deemed  to
          beneficially  own  277,580  shares or 7.9% of the  Issuer's  shares as
          indicated in (vi) - (viii) above.

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

(4) Each warrant entitles Blair Investment to purchase one share at a price
of $2.40 per share, exercisable from January 30, 1992 to January 30, 1997.

(5) Each warrant entitles Blair Investment to purchase one share at a price
of $13.90 per share  exercisable  from March 1, 1993 to March 1, 1998.  

(6) This Warrant  entitles Blair  Investment to purchase  350,000 shares at
$1.00 per share exercisable from July 13, 1995 to July 13, 1999.

(7) This Warrant  entitles Blair  Investment to purchase 200,000 shares at
$.25 per share exercisable from July 31, 1996 to July 31, 2001.

(8) Parliament Hill  Corporation ("PHC")  is a private  corporation of which
Rosalind Davidowitz  beneficially owns approximately 72.6%, and Blair Investment
beneficially  owns  approximately  18%.   Parliament  Hill  Capital  Corporation
("PHCC") is a wholly-owned subsidiary of PHC.

(9) Each warrant  entitles  PHCC to purchase one share at a price of $14.25
per share until April,  1997.  

(10) Although Mr. Davis is including securities owned by Rosalind Davidowitz
and  Rivkalex in the  aggregate  amount of shares  owned by him,  filing of this
statement  shall  not  be  deemed  an  admission  by J.  Morton  Davis  that  he
beneficially owns the securities  attributed to Rosalind  Davidowitz or Rivkalex
for any purpose. J. Morton Davis expressly disclaims beneficial ownership of all
securities held by Rosalind Davidowitz and Rivkalex.

  
<PAGE>

                                                         Page 6 of 14 pages




Item 5. (c) is hereby amended by adding the following paragraphs:



          On July 31,  1996,  Blair  Investment  received a Warrant to  purchase
          200,000 of the Issuer's shares at $.25 per share exercisable from July
          31, 1996 to July 31, 2001 pursuant to a Loan  Agreement  between Blair
          Investment and the Issuer.

 
Item 6. is hereby amended by adding the following paragraph thereto:

          On July 31,  1996,  Blair  Investment  entered  into a Loan  Agreement
          whereby Blair Investment agreed to advance to the Issuer $200,000 (the
          "Loan"),  to be evidenced by a Promissory Note in the principal amount
          of $200,000.  In order to induce Blair Investment to execute this Loan
          Agreement  and make the  Loan  available  to the  Issuer,  the  Issuer
          granted concurrently to Blair Investment a Warrant to purchase 200,000
          of the Issuer's shares at $.25 per share,  exercisable  July 31, 1996
          to July 31, 2001. A copy of the Warrant is annexed hereto as Exhibit M
          and  incorporated  herein  by  reference.  On  July  31,  1996,  Blair
          Investment  loaned the Issuer the  principal  amount of $200,000,  and
          received a Promisorry Note in the principal amount of $200,000.

Item 7. is hereby amended by adding the following thereto:

Exhibit M - Warrant to purchase 200,000 shares dated July 31, 1996.



                                 SIGNATURES

 After reasonable inquiry and to the best of my knowledge and belief, we certify
that the information set forth in this statement is true, complete and correct.




                                          /s/ J. Morton Davis
Date:    August 5, 1996                   _____________________________
         New York, New York                J. Morton Davis





                                       D.H. BLAIR INVESTMENT BANKING CORP.


                                           /s/ David Nachamie
Date:    August 5, 1996                by_____________________________
         New York, New York              David Nachamie
                                         Treasurer




                                                       Page 7 of 14 pages


                            EXHIBIT M

                   [SEE LEGENDS ON PAGE 7]

No. W-1                No. of Shares Subject to Warrant:  200,000


Void after 5:00 p.m. Los Angeles, California Time on July  31,
2001.


                WARRANT TO PURCHASE OF COMMON STOCK
                              OF
                   ADVANCED DETECTORS, INC.


           This is to certify that, for value received,

                 D.H. BLAIR INVESTMENT BANKING CORP.


("Holder")  is  entitled to  purchase,  subject to the  provisions  of this
Warrant,  from Advanced  Detectors,  Inc., a Delaware  corporation  ("Company"),
200,000 shares of Common Stock, $.01 par value, of the Company ("Common Stock"),
at a price per share equal to $0.25 at any time during the period beginning July
31, 1996 and ending 5:00 p.m. Los Angeles, California Time on July 31, 2001. The
number of  shares  of Common  Stock to be  received  upon the  exercise  of this
Warrant  and the  price to be paid for a share of Common  Stock may be  adjusted
from  time to time  as  hereinafter  set  forth.  The  shares  of  Common  Stock
deliverable  upon  such  exercise,  and as  adjusted  from  time  to  time,  are
hereinafter sometimes referred to as "Warrant Shares," and the exercise price of
a share of Common Stock in effect at any time and as adjusted  from time to time
is hereinafter sometimes referred to as the "Exercise Price."


                (a)  EXERCISE OF WARRANT.  Subject to the  provision of Section 
(h) hereof, this Warrant may be exercised in whole or in part at any time or
from  time to time on or after  July 31,  1996 and  until  July 31,  2001 or, if
either  such  day  is a day on  which  banking  institutions  in  the  State  of
California are authorized by law to close, then on the next succeeding day which
shall not be such a day, by presentation  and surrender hereof to the Company at
its principal  office,  or at the office of its stock transfer  agent,  with the
Purchase  Form annexed  hereto duly executed and  accompanied  by payment of the
Exercise Price for the number of shares  specified in such form, in lawful money
of the United States of America in cash or by official  bank or certified  check
made payable to Advanced  Detectors,  Inc. If this Warrant shall be exercised in
part only, the Company shall,  upon surrender of this Warrant for  cancellation,
execute and deliver a new Warrant evidencing the rights of the Holder thereof to
purchase the balance of the shares purchasable  thereunder.  Upon receipt by the
Company of this Warrant at its office, or by the stock transfer


<PAGE>

                                                       Page 8 of 14 pages


agent of the Company at is office, in proper form for exercise and together with
payment of the Exercise Price in the manner provided herein, the Holder shall be
deemed  to be the  holder of  record  of the  shares  of  Common  Stock or other
securities issuable upon such exercise,  provided,  however, that if at the date
of surrender of such Warrants and payment of such Exercise  Price,  the transfer
books  for the  Common  Stock or such  other  securities  shall be  closed,  the
certificates  for the  shares  of other  securities  in  respect  of which  such
Warrants are then exercised shall be issuable as of the date on which such books
shall next be opened and until such date the  Company  shall be under no duty to
deliver any certificate for such shares or other securities and the Holder shall
not be deemed to have  become a holder of record of such  shares or the owner of
any such other securities.

                  (b)  RESERVATION OF SHARES.  The Company hereby agrees that at
all times there shall be reserved for issuance  and/or delivery upon exercise of
this  Warrant such number of shares of its Common Stock as shall be required for
issuance and delivery upon exercise of this Warrant.

                  (c)  FRACTIONAL  SHARES.  The Company shall not be required to
issue  fractions  of shares on the  exercise of  Warrants.  If any fraction of a
share  would,  except for the  provisions  of this  Section,  be issuable on the
exercise  of any  Warrant,  the  Company  will  (1) if the  fraction  of a share
otherwise  issuable is equal to or less than  one-half,  round down and issue to
the Holder only the largest  whole number of shares of Common Stock to which the
Holder  is  otherwise  entitled,  or (2) if the  fraction  of a share  otherwise
issuable  is  greater  than  one-half,  round-up  and  issue to the  Holder  one
additional  share of Common  Stock in addition to the  largest  whole  number of
shares of Common Stock to which the holder is otherwise entitled.

                  (d) EXCHANGE,  TRANSFER,  ASSIGNMENT OR LOSS OF WARRANT.  This
Warrant is  exchangeable,  without  expense,  at the option of the Holder,  upon
presentation  and surrender  hereof to the Company or at the office of its stock
transfer agent, if any, for other Warrants of different  denominations entitling
the holder  thereof to  purchase in the  aggregate  the same number of shares of
Common Stock  purchasable  hereunder.  Subject to the provisions of Section (h),
upon  surrender  of this  Warrant  to the  Company or at the office of its stock
transfer  agent,  if any, with the Assignment  Form annexed hereto duly executed
and funds  sufficient to pay any  applicable  transfer  tax, the Company  shall,
without  charge,  execute and deliver a new Warrant in the name of the  assignee
named in such  instrument  of  assignment  and this  Warrant  shall  promptly be
cancelled.  This Warrant may be divided or combined  with other  Warrants  which
carry the same rights upon  presentation  hereof at the office of the Company or
at the  office of its stock  transfer  agent,  if any,  together  with a written
notice specifying the names and denominations in which new

                                       - 2 -

<PAGE>
                                             
                                                       Page 9 of 14 pages


Warrants are to be issued and signed by the Holder hereof. The term "Warrant" as
used herein  includes  any  Warrants  into which this  Warrant may be divided or
exchanged.  Upon  receipt by the Company of evidence  satisfactory  to it of the
loss,  theft,  destruction  or mutilation  of this Warrant,  and (in the case of
loss,  theft or destruction) of such  indemnification  as the Company may in its
discretion  impose,  and upon  surrender and  cancellation  of this Warrant,  if
mutilated,  the Company will execute and deliver a new Warrant of like tenor and
date.

                  (e)  RIGHTS OF THE  HOLDER.  The Holder  shall not,  by virtue
hereof, be entitled to any rights of a stockholder in the Company, either at law
or in equity, and the rights of the Holder are limited to those expressed in the
warrant and are not  enforceable  against  the Company  except to the extent set
forth herein.

                  (f)  ANTI-DILUTION  PROVISIONS.  The  Exercise  Price  and the
number and kind of  securities  purchasable  upon the  exercise of this  Warrant
shall be subject to adjustment from time to time as hereinafter provided:

                           (1)      In the case of Company shall issue Common
Stock as a dividend upon Common Stock or in payment of a dividend thereon, shall
subdivide  the number of  outstanding  shares of its Common Stock into a greater
number of shares  or shall  contract  the  number of  outstanding  shares of its
Common Stock into a lesser number of shares,  the Exercise  Price then in effect
shall be adjusted, effective at the close of business on the record date for the
determination of stockholders entitled to receive such dividend or be subject to
such  subdivision or  contraction,  to the price  (computed to the nearest cent)
determined  by dividing  (A) the product  obtained by  multiplying  the Exercise
Price in effect  immediately  prior to the close of business on such record date
by the  number of shares of Common  Stock  outstanding  prior to such  dividend,
subdivision  or  contraction,  by (B) the sum of the  number of shares of Common
Stock outstanding immediately after such dividend, subdivision, or contraction.

                           (2)      If any capital reorganization or
reclassification of the capital stock of the Company (other than as set forth in
subsection  (1) of this Section (f), or  consolidation  or merger of the Company
with another corporation,  or the sale of all or substantially all of its assets
to  another  corporation  shall  be  effected,  then,  as a  condition  of  such
reorganization,  reclassification,  consolidation,  merger or sale,  lawful  and
adequate  provision  shall be made  whereby  the  holder of each  Warrant  shall
thereafter  have the right to purchase  and receive  upon the basis and upon the
terms and  conditions  specified  in the  Warrant  and in lieu of the  shares of
Common Stock of the Company immediately theretofore purchasable and

                                - 3 -

<PAGE>

                                                       Page 10 of 14 pages


receivable  upon the exercise of the rights  represented  by such Warrant,  such
shares of stock,  securities  or assets as may be issued or payable with respect
to or in exchange for a number of outstanding  shares of such Common Stock equal
to the number of shares of such Common Stock immediately theretofore purchasable
and receivable  upon the exercise of the rights  represented by such Warrant had
such reorganization,  reclassification,  consolidation, merger or sale not taken
place, and in any such case appropriate  provision shall be made with respect to
the rights and  interest  of the  Holder to the end that the  provisions  of the
Warrant  (including,  without  limitation,  provisions  for  adjustment  of  the
Exercise  Price and of the  number  of  shares  issuable  upon the  exercise  of
Warrants)  shall  thereafter be applicable  as nearly as may be  practicable  in
relation to any shares of stock,  securities,  or assets thereafter  deliverable
upon exercise of Warrants.  The Company shall not effect any such consolidation,
merger or sale unless prior to or simultaneously with the consummation  thereof,
the  successor  corporation  purchasing  such assets  shall  assume,  by written
instrument,  the  obligation  to  deliver to the  Holder  such  shares of stock,
securities or assets as, in accordance with the foregoing provisions, the Holder
may be entitled to purchase.

                           (3)      Upon each adjustment of the Exercise Price
pursuant to  subsection  (1) of this Section (f), the number of shares of Common
Stock specified in each Warrant shall  thereupon  evidence the right to purchase
that number of shares of Common Stock  (calculated to the nearest hundredth of a
share of Common  Stock)  obtained by  multiplying  the Exercise  Price in effect
immediately  prior to such  adjustment  by the number of shares of Common  Stock
purchasable  immediately  prior to such adjustment upon exercise of such Warrant
and dividing the product so obtained by the Exercise  Price in effect after such
adjustment.

                         (4)      Irrespective of any adjustments of the number
or kind of securities  issuable upon exercise of warrants or the Exercise Price,
Warrants  theretofore  or  thereafter  issued may  continue  to express the same
number of shares of Common  Stock and  Exercise  Price as are  stated in similar
Warrants previously issued.

                           (5)      The Company may, at its sole option, retain
the independent  public  accounting firm regularly  retained by the Company,  or
another firm of independent public  accountants of recognized  standing selected
by the Company's Board of Directors, to make any computation required under this
Section (f), and a certificate signed by such firm shall be conclusive  evidence
of any computation made under this Section (f).

                           (6)      Whenever there is an adjustment in the
Exercise Price or in the number or kind of securities  issuable upon exercise of
the Warrants, or both, as provided in this

                                  - 4 -

<PAGE>

                                                       Page 11 of 14 pages


Section (f), the Company shall (i) promptly file in the custody of its Secretary
or Assistant  Secretary a certificate signed by the Chairman of the Board of the
President or Vice  President of the Company and by the Treasurer or an Assistant
Treasurer or the Secretary or an Assistant Secretary of the Company, setting for
the facts  requiring  such  adjustment  and the  number  and kind of  securities
issuable upon exercise of each Warrant after such  adjustment;  and (ii) cause a
notice  stating that such  adjustment has been effected and stating the Exercise
Price  then in  effect  and the  number  and kind of  securities  issuable  upon
exercise of each Warrant to be send to each registered holder of a Warrant.

                           (7)      The Exercise Price and the number of shares
issuable upon  exercise of a Warrant shall not be adjusted  except in the manner
and only upon the occurrence of the events heretofore  specifically  referred to
in this Section (f).

                           (8)      The Board of Directors of the Company may,
without the prior consent of the Holder,  reduce the Exercise  Price or increase
the number of shares of Common Stock or other securities  issuable upon exercise
of the Warrant.

                 (g) REGISTRATION RIGHTS.  During the period commencing on July 
31, 1997 and ending on July 31, 2001 (i) the Holder (upon the request of the
Holders of Warrants  for the exercise of at least 50% of the  aggregate  Warrant
Shares  listed  on Annex  "A"  attached  hereto),  shall  have the  right on one
occasion to demand that the Company expeditiously file a registration  statement
under the Federal  securities  laws covering this Warrant and the Warrant Shares
and (ii) the Company  shall give the Holder  written  notice of its intention to
engage in a  registration  of Common  Stock  under the Federal  securities  laws
(other than a registration  of Common Stock in connection  with any stock option
plan, stock purchase plan, savings or similar plan, or an acquisition, merger or
exchange of stock or any  registration  on Form S-4 or Form S-8 or any successor
Form thereto) thirty (30) days prior to the filing of the registration statement
with the Securities and Exchange  Commission  relating to the registration,  and
shall  offer to include  the  Warrant  Shares in such  registration,  and at the
written request of the Holder,  the Company shall include the Warrant Shares (or
such  portion of the Warrant  Shares as may be  requested  by the Holder) in the
registration  statement;   provided,   however,  that  if  the  offering  is  an
underwritten offering, and in the judgment of the managing underwriter,  if any,
the inclusion of the Warrant Shares would materially adversely affect the public
offering  of the Common  Stock,  the number of Warrant  shares to be  registered
shall be reduced,  pro rata together with the Warrant Shares of other Holders of
Warrants  to whom a similar  registration  right  also has been  granted  by the
Company, or eliminated, if necessary or advisable.


                                   - 5 -

<PAGE>

                                                       Page 12 of 14 pages


                           (1)    The Company shall bear the costs and expenses
of any  registration  of the Warrant  Shares under this  Section (g);  provided,
however,  that the Holder shall bear the cost of fees for the Holder's  counsel,
and  any  registration  fees,  transfer  taxes  or  underwriting  discounts  and
commissions   applicable  to  the  Holder's   Warrant  Shares  included  in  the
registration statement.

                           (2)      Whenever the Company shall register any of
the Warrant  Shares  pursuant to any of the  provisions of this Section (g), the
Company shall also be obligated to:

                                 (A)     Prepare for filing with the Securities
and Exchange  Commission such  amendments and  supplements to said  registration
statement and the prospectus used in connection therewith as may be necessary to
keep said registration  statement effective and to comply with the provisions of
the Securities Act of 1933, as amended (the "Act"),  with respect to the sale of
the  Warrant  Shares  covered  by said  registration  statement  for the  period
necessary to complete the proposed offering of the Warrant Shares,  which period
shall  be no  greater  than  one year  from  the  date of  effectiveness  of the
registration statement;

                                    (B)   Furnish to the Holder such copies of
preliminary and final  prospectuses  and such other documents as the Holder may
reasonably request to facilitate the offering of the Warrant Shares;

                                    (C)   Use reasonable efforts to register or
qualify the  Warrant  Shares  covered by the  registration  statement  under the
securities or blue sky laws of such  jurisdictions  as the Holder may reasonable
request; provided, however, that the Company will not be required to (i) qualify
generally to do business in any jurisdiction  where it would not be required but
for this subsection 2(C) of this Section (g); (ii) subject itself to taxation in
such  jurisdiction;  (iii)  consent  to  general  service  of  process  in  such
jurisdiction;  (iv)  register  in any state  requiring  as a  condition  to such
registration,  escrow or  surrender  of any  securities  of the  Company  or any
security  holder;  or (v) incur expenses in excess of an aggregate of $10,000 in
connection with such  registration or  qualification on behalf of all Holders of
Warrant  Shares.  In the event such expenses would exceed  $10,000,  the Company
may,  in its  sole  discretion,  determine  the  jurisdictions  in which it will
register or qualify such Warrant Shares; and

                                    (D)     Furnish the Holder a copy of all
documents  filed and all  correspondence  to or from the Securities and Exchange
Commission in connection with the offering.

                           (3)      In connection with the registration of the
Warrant Shares, the Holder shall furnish the Company with appropriate 
information as may be necessary to be included in the


                                 - 6 -

<PAGE>


                                                       Page 13 of 14 pages


Registration  statement  covering  the  Warrant  Shares  and (ii) if  requested,
execute a copy of the  underwriting  agreement  that the  Company is required to
execute in  connection  with the  registration  statement  in which the  Warrant
Shares are to be  included.  Any  failure by the Holder to meet its  obligations
under this  clause  (3) this  Section  (g) shall  relive  the  Company  from its
registration obligation as to the Holder's Warrant Shares.

                          (4)      Nothing herein shall prevent the Company from
withdrawing the registration  statement in which the Warrant Shares are included
prior to its effectiveness, and in such event, the Company shall have no further
obligation to the Holders whose Warrant  Shares are included  therein other than
to again comply with the provisions of this Section (g).

                  (h)  TRANSFER  TO COMPLY WITH THE  SECURITIES  ACT OF 1933 AND
OTHER  APPLICABLE  SECURITIES  LAWS.  This Warrant or the Warrant  Shares or any
other security  issued or issuable upon exercise of this Warrant may not be sold
or otherwise  disposed of unless the Holder provides the Company with an opinion
of counsel  satisfactory to the Company in form satisfactory to the Company that
this Warrant or the Warrant Shares may be legally  transferred without violating
the Act and any other applicable securities law and then, if such opinion states
that certificates  representing the Warrants or Warrant Shares being transferred
shall be required to bear a legend  restricting  further transfer,  only against
receipt of an agreement of the  transferee to comply with the provisions of this
Section (h) with respect to any resale or other disposition of such securities.


                                         ADVANCED DETECTORS, INC.

                                        
[SEAL]
                                        /s/ James Gerberman
                                   By:__________________________________
                                        James Gerberman
                                        President


Attest:



    /s/ Jan Iwanczyk
By:______________________________
   Jan Iwanczyk
   Executive Vice President


By:
                                   , Secretary

THE WARRANT  REPRESENTED BY THIS  CERTIFICATE HAS NOT BEEN REGISTERED  UNDER THE
SECURITIES ACT OF 1933. THE WARRANT  REPRESENTED  BY THIS  CERTIFICATE  HAS BEEN
TAKEN BY THE REGISTERED  OWNER FOR  INVESTMENT,  AND WITHOUT A VIEW TO RESALE OR
DISTRIBUTION THEREOF, AND MAY NOT BE TRANSFERRED OR DISPOSED OF

                                  - 7 -

<PAGE>


                                                       Page 14 of 14 pages



WITHOUT AN OPINION OF COUNSEL  SATISFACTORY  TO THE ISSUER THAT SUCH TRANSFER OR
DISPOSITION  DOES NOT VIOLATE THE  SECURITIES  ACT OF 1933,  AS AMENDED,  OR THE
RULES AND REGULATIONS THEREUNDER.

PURSUANT TO SECTION 203(d) OF THE PENNSYLVANIA SECURITIES ACT OF 1972 AND TO THE
EXTENT,  IF ANY,  REQUIRED  THEREBY,  THE PURCHASER OF THIS SECURITY  WHICH IS A
RESIDENT OF THE  COMMONWEALTH  OF  PENNSYLVANIA  HEREBY  AGREES NOT TO SELL THIS
SECURITY WITHIN TWELVE MONTHS AFTER THE DATE OF PURCHASE.


                                  - 8 -
 

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June 28, 1996 1:45pm




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