UROGEN CORP
SC 13G/A, 1999-02-12
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>
 
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549

                                 SCHEDULE 13G

                   UNDER THE SECURITIES EXCHANGE ACT OF 1934

                              (Amendment No. 1)*

                                 UROGEN CORP.
                                 ------------
                               (Name of Issuer)

                   Common Stock, $0.001 par value per share
                   ----------------------------------------
                        (Title of Class of Securities)

                                  917271 10 8
                                  -----------
                                (CUSIP Number)

                                 July 8, 1998
                                 ------------
            (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

     [_]   Rule 13d-1(b)

     [X]   Rule 13d-1(c)

     [_]   Rule 13d-1(d)

*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).



POTENTIAL PERSONS WHO ARE TO RESPOND TO THE COLLECTION OF INFORMATION CONTAINED
IN THIS FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM DISPLAYS A CURRENTLY
VALID OMB CONTROL NUMBER.

SEC 1745 (3-98)

                                  Page 1 of 6
<PAGE>
 
- -----------------------                                  ---------------------
 CUSIP NO. 917271 10 8              13G                   PAGE 2 OF 6 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAMES OF REPORTING PERSONS.
 1    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

      Quadros, Paul D.

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4    
      UNITED STATES

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5   
     NUMBER OF            481,667*
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          -0-
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7    
    REPORTING             481,667*
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH:         8
                          -0-
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9  
      481,667*

- ------------------------------------------------------------------------------
      CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10    (SEE INSTRUCTIONS)
 
      [_] 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11    
      5.1%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
12
      IN

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

                               Page 2 of 6 pages

<PAGE>
 
                         INSTRUCTIONS FOR SCHEDULE 13G

INSTRUCTIONS FOR COVER PAGE

(1)  Names and I.R.S. Identification Numbers of Reporting Persons--Furnish the
     full legal name of each person for whom the report is filed--i.e., each
     person required to sign the schedule itself--including each member of a
     group. Do not include the name of a person required to be identified in the
     report but who is not a reporting person. Reporting persons that are
     entities are also requested to furnish their I.R.S. identification numbers,
     although disclosure of such numbers is voluntary, not mandatory (see
     "SPECIAL INSTRUCTIONS FOR COMPLYING WITH SCHEDULE 13G" below).

(2)  If any of the shares beneficially owned by a reporting person are held as a
     member of a group and that membership is expressly affirmed, please check
     row 2(a). If the reporting person disclaims membership in a group or
     describes a relationship with the other persons but does not affirm the
     existence of a group, please check row 2(b) [unless it is a joint filing
     pursuant to Rule 13d-1(k)(1) in which case it may not be necessary to check
     row 2(b)].

(3)  The third row is for SEC internal use; please leave blank.

(4)  Citizenship or Place of Organization--Furnish citizenship if the named
     reporting person is a natural person.  Otherwise, furnish place of
     organization.

(5)-(9), (11) Aggregate Amount Beneficially Owned By Each Reporting Person,
     Etc.--Rows (5) through (9) inclusive, and (11) are to be completed in
     accordance with the provisions of Item 4 of Schedule 13G.  All percentages
     are to be rounded off to the nearest tenth (one place after decimal point).

(10) Check if the aggregate amount reported as beneficially owned in row (9)
     does not include shares as to which beneficial ownership is disclaimed
     pursuant to Rule 13d-4 (17 CFR 240.13d-4) under the Securities Exchange Act
     of 1934.

(12) Type of Reporting Person--Please classify each "reporting person,,
     according to the following breakdown (see Item 3 of Schedule 13G) and place
     the appropriate symbol on the form:

                            Category                                  Symbol
           Broker Dealer                                                BD
           Bank                                                         BK
           Insurance Company                                            IC
           Investment Company                                           IV
           Investment Adviser                                           IA
           Employee Benefit Plan, Pension Fund, or Endowment Fund       EP
           Parent Holding Company/Control Person                        HC
           Savings Association                                          SA
           Church Plan                                                  CP
           Corporation                                                  CO
           Partnership                                                  PN
           Individual                                                   IN
           Other                                                        OO

Notes:

   Attach as many copies of the second part of the cover page as are needed, one
reporting person per page.

   Filing persons may, in order to avoid unnecessary duplication, answer items
on the schedules (Schedules 13D, 13G or 14D-1) by appropriate cross references
to an item or items on the cover page(s).  This approach may only be used where
the cover page item or items provide all the disclosure required by the schedule
item.  Moreover, such a use of a cover page item will result in the item
becoming a part of the schedule and accordingly being considered as "filed,, for
purposes of Section 18 of the Securities Exchange Act or otherwise subject to
the liabilities of that section of the Act.

   Reporting persons may comply with their cover page filing requirements by
filing either completed copies of the blank forms available from the Commission,
printed or typed facsimiles, or computer printed facsimiles, provided the
documents filed have identical 

                                  Page 3 of 6
<PAGE>
 
formats to the forms prescribed in the Commission's regulations and meet
existing Securities Exchange Act rules as to such matters as clarity and size
(Securities Exchange Act Rule 12b-12).

              SPECIAL INSTRUCTIONS FOR COMPLYING WITH SCHEDULE 13G

   Under Sections 13(d), 13(g), and 23 of the Securities Exchange Act of 1934
and the rules and regulations thereunder, the Commission is authorized to
solicit the information required to be supplied by this schedule by certain
security holders of certain issuers.

   Disclosure of the information specified in this schedule is mandatory, except
for I.R.S. identification numbers, disclosure of which is voluntary.  The
information will be used for the primary purpose of determining and disclosing
the holdings of certain beneficial owners of certain equity securities.  This
statement will be made a matter of public record.  Therefore, any information
given will be available for inspection by any member of the public.

   Because of the public nature of the information, the Commission can use it
for a variety of purposes, including referral to other governmental authorities
or securities self-regulatory organizations for investigatory purposes or in
connection with litigation involving the Federal securities laws or other civil,
criminal or regulatory statutes or provisions.  I.R.S. identification numbers,
if furnished, will assist the Commission in identifying security holders and,
therefore, in promptly processing statements of beneficial ownership of
securities.

   Failure to disclose the information requested by this schedule, except for
I.R.S. identification numbers, may result in civil or criminal action against
the persons involved for violation of the Federal securities laws and rules
promulgated thereunder.

                              GENERAL INSTRUCTIONS

A. Statements filed pursuant to Rule 13d-1(b) containing the information
   required by this schedule shall be filed not later than February 14 following
   the calendar year covered by the statement or within the time specified in
   Rules 13d-1(b)(2) and 13d-2(c).  Statements filed pursuant to Rule 13d-1(c)
   shall be filed within the time specified in Rules 13d-1(c), 13d-2(b) and 13d-
   2(d).  Statements filed pursuant to Rule 13d-1(d) shall be filed not later
   than February 14 following the calendar year covered by the statement
   pursuant to Rules 13d-1(d) and 13d-2(b).

B. Information contained in a form which is required to be filed by rules under
   section 13(f) (15 U.S.C. 78m(f)) for the same calendar year as that covered
   by a statement on this schedule may be incorporated by reference in response
   to any of the items of this schedule.  If such information is incorporated by
   reference in this schedule, copies of the relevant pages of such form shall
   be filed as an exhibit to this schedule.

C. The items numbers and captions of the items shall be included but the text of
   the items is to be omitted.  The answers to the items shall be so prepared as
   to indicate clearly the coverage of the items without referring to the text
   of the items.  Answer every item.  If an item is inapplicable or the answer
   is in the negative, so state.

ITEM 1.
        (a)  Name of Issuer

        UroGen Corp.

        (b)  Address of Issuer's Principal Executive Offices

        10835 Altman Row, Suite 150

        San Diego, CA 92121

ITEM 2.
        (a)  Name of Person Filing

        Paul D. Quadros


        (b)  Address of Principal Business Office or, if none, Residence

        10835 Altman Row, Suite 150

        San Diego, CA 92121

                                  Page 4 of 6

<PAGE>
 
        (c)  Citizenship

        United States

        (d)  Title of Class of Securities

        Common Stock, $0.001 par value, of UroGen Corp.

        (e)  CUSIP Number

        917271 10 8


ITEM 3.  If this statement is filed pursuant to (S)(S)240.13d-1(b) or
240.13d-2(b) or (c), check whether the person filing is a:

   (a) [_] Broker or dealer registered under section 15 of the Act 
           (15 U.S.C. 78o).

   (b) [_] Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

   (c) [_] Insurance company as defined in section 3(a)(19) of the Act 
           (15 U.S.C. 78c).

   (d) [_] Investment company registered under section 8 of the Investment 
           Company Act of 1940 (15 U.S.C. 80a-8).

   (e) [_] An investment advisor in accordance with (S)240.13d-1(b)(1)(ii)(E);

   (f) [_] An employee benefit plan or endowment fund in accordance with 
           (S)240.13d-1(b)(1)(ii)(F);

   (g) [_] A parent holding company or control person in accordance with 
           (S)240.13d-1(b)(1)(ii)(G);

   (h) [_] A savings associations as defined in Section 3(b) of the Federal 
           Deposit Insurance Act (12 U.S.C. 1813);

   (i) [_] A church plan that is excluded from the definition of an investment
           company under section 3(c)(14) of the Investment Company  Act of 1940
           (15 U.S.C. 80a-3);

   (j) [_] Group, in accordance with (S)240.13d-1(b)(1)(ii)(J).


ITEM 4.   OWNERSHIP

   Provide the following information regarding the aggregate number and
percentage of the class of securities of the issuer identified in Item 1.

   (a) Amount of beneficially owed:  481,667*

   (b)  Percent of class:  5.1%

   (c) Number of shares as to which the person has:

      (i)    Sole power to vote or to direct the vote    481,667* 

      (ii)   Shared power to vote or to direct the vote       -0-

      (iii)  Sole power to dispose or to direct the disposition of     481,667*

      (iv)   Shared power to dispose or to direct the disposition of   -0-

   Instruction.  For computations regarding securities which represent a right
to acquire an underlying security see (S)240.13d-3(d)(1).


   *  This amount includes debt convertible at the holder's option into 50,000
      shares of Common Stock and warrants to purchase 25,000 shares of Common
      Stock.


ITEM 5.   OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

   If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following [_].

                                  Page 5 of 6


<PAGE>
 
Instruction:  Dissolution of a group requires a response to this item.

ITEM 6.  OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON

Not applicable.


ITEM 7.  IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE
         SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY

Not applicable.

ITEM 8.  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

Not applicable.

ITEM 9.  NOTICE OF DISSOLUTION OF GROUP

Not applicable.

ITEM 10. CERTIFICATION

         By signing below I certify that, to the best of my knowledge and
         belief, the securities referred to above were not acquired and are not
         held for the purpose of or with the effect of changing or influencing
         the control of the issuer of the securities and were not acquired and
         are not held in connection with or as a participant in any transaction
         having that purpose or effect.


                                   SIGNATURE

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

                                             February 12, 1999
                                    -------------------------------------
                                                    Date

                                            /s/ PAUL D. QUADROS
                                    -------------------------------------
                                                  Signature
 
                                    -------------------------------------
                                                  Name/Title

   The original statement shall be signed by each person on whose behalf the
statement is filed or his authorized representative.  If the statement is signed
on behalf of a person by his authorized representative other than an executive
officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

NOTE:  Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits.  See (S)240.13d-7 for other
parties for whom copies are to be sent.

   ATTENTION:  INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT CONSTITUTE FEDERAL
CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001)

                                  Page 6 of 6



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