OPTICAL SENSORS INC
SC 13D/A, 1999-06-30
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D/A
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                (AMENDMENT NO. 1)

                          OPTICAL SENSORS INCORPORATED
                         ------------------------------
                                (Name of Issuer)


                     Common Stock $.01 par value per share
                         ------------------------------
                         (Title of Class of Securities)

                                   68384P107
                                 --------------
                                 (CUSIP Number)


      Hayden R. Fleming, 14988 N. 78th Way, Suite 200 Scottsdale AZ 85260
                                 (602) 483-9282
     --------------------------------------------------------------------
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)

                                  May 12, 1999
             -------------------------------------------------------
             (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 s.s.  240.13d-1(e),  240.13d-1(f) or 240.13d-1(g), check the
following box [ ].

NOTE:  Schedules  filed in paper format shall include a signed original and five
copies of this  statement,  including all exhibits.  See s.s.  240.13d-7(b)  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
disclosures provided in a prior cover page.

The information required on 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>
                                 SCHEDULE 13D/A
- ---------------------                                        -------------------
CUSIP NO. 68384P107                                          PAGE  2 OF  6 PAGES
- ---------------------                                        -------------------

1     NAMES OF REPORTING PERSONS
      S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      HAYDEN R. FLEMING
      --------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [X]
                                                                         (b) [ ]
      --------------------------------------------------------------------------
3     SEC USE ONLY

      --------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      AF AND PF
      --------------------------------------------------------------------------
5     CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) OR 2(e)                                                  [ ]

      --------------------------------------------------------------------------
6     CITZENSHIP OR PLACE OF ORGANIZATION

      U.S.A.
      --------------------------------------------------------------------------
                    7  SOLE VOTING POWER
                       573,604
       NUMBER OF       ---------------------------------------------------------
        SHARES      8  SHARED VOTING POWER
      BENEFICIALLY     95,400
       OWNED BY        ---------------------------------------------------------
         EACH       9  SOLE DISPOSITIVE POWER
       REPORTING       573,604
        PERSON         ---------------------------------------------------------
         WITH      10  SHARED DISPOSITIVE POWER
                       95,400
                       ---------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      669,004
      --------------------------------------------------------------------------
12    CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*     [ ]


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

      7.6%
      --------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      IN
      --------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
      (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.
<PAGE>
                                 SCHEDULE 13D/A
- ---------------------                                        -------------------
CUSIP NO. 68384P107                                          PAGE  3 OF  6 PAGES
- ---------------------                                        -------------------

1     NAMES OF REPORTING PERSONS
      S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      CIRCLE F VENTURES, LLC  86-0820669
      --------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [X]
                                                                         (b) [ ]
      --------------------------------------------------------------------------
3     SEC USE ONLY

      --------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
      --------------------------------------------------------------------------
5     CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) OR 2(e)                                                  [ ]

      --------------------------------------------------------------------------
6     CITZENSHIP OR PLACE OF ORGANIZATION

      GEORGIA - U.S.A.
      --------------------------------------------------------------------------
                    7  SOLE VOTING POWER
                       553,604
       NUMBER OF       ---------------------------------------------------------
        SHARES      8  SHARED VOTING POWER
      BENEFICIALLY     NONE
       OWNED BY        ---------------------------------------------------------
         EACH       9  SOLE DISPOSITIVE POWER
       REPORTING       553,604
        PERSON         ---------------------------------------------------------
         WITH      10  SHARED DISPOSITIVE POWER
                       NONE
                       ---------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      553,604
      --------------------------------------------------------------------------
12    CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*     [ ]


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

      6.3%
      --------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      OO
      --------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
      (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.
<PAGE>
                                 SCHEDULE 13D/A

ITEM 1. SECURITIES AND ISSUER

         The title of the class of equity  securities  to which  this  statement
relates is Common Stock, par value $.01 per share (the "Common Stock"). The name
of the issuer is Optical Sensors  Incorporated  (the  "Company").  The principal
executive  offices of the Company is 7615 Golden Triangle  Drive,  Suite A, Eden
Prairie, MN 55344.

ITEM 2. IDENTITY AND BACKGROUND

         The reporting persons are Hayden R. Fleming and Circle F Ventures,  LLC
("Circle F").  Hayden R. Fleming is the managing member of Circle F. Circle F is
a Georgia limited liability company whose principal business is the operation of
an investment fund and whose  principal  business and office is located at 14988
N. 78th Way, Suite 200, Scottsdale, Arizona 85260. Circle F has not been a party
to any civil or criminal proceeding required to be disclosed in response to this
Item.

The following information is provided for Hayden R. Fleming:

          (a)  Name. Hayden R. Fleming.

          (b)  Address. 14988 N. 78th Way, Suite 200, Scottsdale, Arizona 85260.

          (c)  Principal  Occupation  and  Employment.  Hayden R. Fleming is the
               principal of Fleming Securities, Inc., a broker/dealer.

          (d)  Criminal Proceedings. None.

          (e)  Civil Proceedings. None

          (f)  Citizenship. United States of America.

ITEM 3. SOURCE AND AMOUNT AT FUNDS OR OTHER CONSIDERATION.

         Personal funds of Hayden R. Fleming and working capital of Circle F.

ITEM 4. PURPOSE OF TRANSACTION

         All of the reported shares are held for investment purposes.

         The  reporting  persons have no plans or  proposals  which relate to or
         would result in:

          (a)  The  acquisition  by any person of  additional  securities of the
               Company, or the disposition of securities of the Company;

          (b)  An  extraordinary  corporate  transaction,   such  as  a  merger,
               organization or liquidation,  involving the Company or any of its
               subsidiaries;

          (c)  A sale or transfer of a material  amount of assets of the Company
               or any of its subsidiaries;

          (d)  Any change in the present board of directors or management of the
               Company, including any plans or proposals to change the number or
               term of directors or to fill any existing vacancies on the Board;

                                    Page -4-
<PAGE>
          (e)  Any  material  change in the present  capitalization  or dividend
               policy of the Company;

          (f)  Any other material change in the Company's  business or corporate
               structure;

          (g)  Changes  in  the  Company's   charter,   bylaws  or   instruments
               corresponding  thereto  or other  actions  which may  impede  the
               acquisition of control of the Company by any person;

          (h)  Causing a class of  securities of the Company to be delisted from
               a national securities exchange or to cease to be authorized to be
               quoted  in  an  inter-dealer  quotation  system  of a  registered
               national securities association;

          (i)  A class of equity securities of the Company becoming eligible for
               termination of  registration  pursuant to Section 12(g)(4) of the
               Act; or

          (j)  Any action similar to any of those enumerated above.

ITEM 5. INTEREST IN SECURITIES OF THE ISSUER

          (a)  Number of Shares/Percentage of Class Beneficially Owned.

                  Circle F Ventures, LLC beneficially owns 553,604 shares of the
         Company's  Common  Stock   representing   approximately   6.3%  of  the
         outstanding  shares of Common Stock based on 8,841,123 shares of Common
         Stock outstanding as indicated by the Company as of May 3, 1999.

                  Hayden R. Fleming  beneficially owns a total of 669,004 shares
         of the Company's Common Stock  representing  approximately  7.6% of the
         outstanding  shares of Common Stock based on 8,841,123 shares of Common
         Stock  outstanding  as indicated  by the Company as of May 3, 1999.  Of
         such  shares,  64,900  shares  are owned by a trust for the  benefit of
         Hayden  Fleming and his wife,  30,500 shares are owned by an individual
         retirement account for the benefit Hayden Fleming's wife, 20,000 shares
         are owned by an individual retirement account for the benefit of Hayden
         Fleming  and  553,604  shares  are owned by Circle F  Ventures  LLC,  a
         limited liability company of which Hayden Fleming is managing member.

                  (b) Nature of Ownership. Circle F Ventures, LLC has sole power
         to  vote  and  direct  the  disposition  of all of the  553,604  shares
         reported as owned by it.  Hayden R.  Fleming has sole power to vote and
         direct the disposition of 573,604 of the reported shares and has shared
         power to vote and  direct  the  disposition  of 95,400 of the  reported
         shares that are owned  jointly  with his wife or for the benefit of his
         wife.

                  (c)  Recent  Transactions.  The  following  is a  list  of all
         transactions  in the Company's  Common Stock by the  reporting  persons
         during the 60 days preceding the date of this Schedule 13D.

                                    Page -5-
<PAGE>
                  The shares below were bought by the  following  purchasers  in
         open market transactions through the NASDAQ market system;

             Date of         Number         Price
           Transaction     of Shares      Per share            Purchaser
           -----------     ---------      ---------            ---------
             4/27/99         1,400        $   .9725       Fleming Trust
             5/12/99         6,500        $  1.0000       Fleming Trust
             5/12/99        10,000        $   .9375       Fleming Trust
             5/19/99        20 000        $  1.1275       Fleming Trust
             5/20/99        17,000        $  1.1309       Circle F Ventures, LLC
             6/22/99         8,150        $   .9505       Circle F Ventures, LLC

          (d)  Rights to Dividends or Proceeds. None.

          (e)  Not applicable.

ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
        SECURITIES OF ISSUER

        None.

ITEM 7. MATERIALS TO BE FILED AS EXHIBITS.

        None.

                                    SIGNATURE

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


June 29, 1999                           /s/ Hayden R. Fleming
- -----------------                       ---------------------------------
    Date                                    Hayden R. Fleming
                                            Name/Title



                                     Circle F Ventures LLC

June 29, 1999                        By /s/ Hayden R. Fleming
- -----------------                       ---------------------------------
    Date                                    Hayden R. Fleming - Managing Member
                                            Name/Title

                                    Page -6-


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