OPTICAL SENSORS INC
SC 13D/A, 2000-10-03
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. 4)*


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

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


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


                                Hayden R. Fleming
            17797 N. Perimeter Drive, Suite 105, Scottsdale AZ 85255
                                 (480) 419-7811
            --------------------------------------------------------
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)


                                 October 2, 2000
             -------------------------------------------------------
             (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 [ ].

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
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>
-------------------                                            -----------------
CUSIP NO. 68384P107              SCHEDULE 13D/A                Page 2 of 6 Pages
-------------------                                            -----------------


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

    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 BOX 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
                     4,375,556
     NUMBER OF       ---------------------------------------------------------
      SHARES      8  SHARED VOTING POWER
    BENEFICIALLY     522,482
     OWNED BY        ---------------------------------------------------------
       EACH       9  SOLE DISPOSITIVE POWER
     REPORTING       4,375,556
      PERSON         ---------------------------------------------------------
       WITH      10  SHARED DISPOSITIVE POWER
                     522,482
                     ---------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    4,898,038
    --------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ]


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

    36.2%
    --------------------------------------------------------------------------
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>
-------------------                                            -----------------
CUSIP NO. 68384P107              SCHEDULE 13D/A                Page 3 of 6 Pages
-------------------                                            -----------------


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

    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 BOX 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
                     4,355,556
     NUMBER OF       ---------------------------------------------------------
      SHARES      8  SHARED VOTING POWER
    BENEFICIALLY     NONE
     OWNED BY        ---------------------------------------------------------
       EACH       9  SOLE DISPOSITIVE POWER
     REPORTING       4,355,556
      PERSON         ---------------------------------------------------------
       WITH      10  SHARED DISPOSITIVE POWER
                     NONE
                     ---------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    4,355,556
    --------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ]


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

    32.1%
    --------------------------------------------------------------------------
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>
-------------------                                            -----------------
CUSIP NO. 68384P107              SCHEDULE 13D/A                Page 4 of 6 Pages
-------------------                                            -----------------


ITEM 1.

     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 17797
N. Perimeter Drive, Suite 105, Scottsdale,  Arizona 85255. 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.  17797 N. Perimeter  Drive,  Suite 105,  Scottsdale,  Arizona
          85255.

     (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 except as provided in
          Item 5 (c) below.

     (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>
-------------------                                            -----------------
CUSIP NO. 68384P107              SCHEDULE 13D/A                Page 5 of 6 Pages
-------------------                                            -----------------


     (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.

          (i)  Circle F  beneficially  owns  4,355,556  shares of the  Company's
     Common Stock  representing 32.1% of the outstanding shares of Common Stock.
     All of such  ownership  arises on an as  converted  basis  from  Circle F's
     holdings of $606,667 of convertible  Notes and 2,333,334 shares of Series A
     Convertible Preferred Stock. See Item 5 (c) below.

          (ii)  Hayden R.  Fleming  beneficially  owns  4,898,038  shares of the
     Company's  Common Stock  representing  36.1% of the  outstanding  shares of
     Common  Stock.  Of such  shares,  4,355,556  shares  are owned by Circle F,
     140,472  shares  are  owned by an  individual  retirement  account  for the
     benefit of Hayden Fleming's wife,  20,000 shares are owned by an individual
     retirement account for the benefit of Hayden Fleming and 382,010 shares are
     owned by a trust  for the  benefit  of  Hayden  Fleming  and his wife  (the
     "Trust").  Of the shares owned by the Trust,  311,110 shares arise on an as
     converted basis from the Trust's  holding of $93,333 of Convertible  Notes.
     See Item 5(c) below.

     (b)  Nature of  Ownership.  Circle F has sole  power to vote and direct the
disposition  of all of the 4,355,556  shares  reported as owned by it. Hayden R.
Fleming has sole power to vote and direct the  disposition  of  4,375,556 of the
reported  shares and has shared  power to vote and  direct  the  disposition  of
522,482 of the reported  shares that are owned  jointly with his wife or for the
benefit of his wife.

     (c) Recent  Transactions.  Pursuant to a Securities Purchase Agreement with
the Company dated August 11, 2000 (the "Securities Purchase Agreement"),  Circle
F purchased  1,000,000  shares of  unregistered  Series A Convertible  Preferred
Stock for $500,000 ($.50 per share) which preferred  shares are convertible into
1,000,000 shares of Common Stock.

     On September 10, 2000,  $606,667 of Convertible  Notes acquired by Circle F
on March 10, 2000 became  convertible  into Common Stock. As of October 2, 2000,
these notes are convertible  into 1,617,778  shares of Common Stock and warrants
to purchase 404,444 shares of Common Stock for $.375 per share which amounts and
warrant  exercise  price are subject to  adjustment  should the Company  request
additional funding under the terms of the Securities Purchase Agreement.
<PAGE>
-------------------                                            -----------------
CUSIP NO. 68384P107              SCHEDULE 13D/A                Page 6 of 6 Pages
-------------------                                            -----------------


     On September 10, 2000,  $93,333 of Convertible  Notes acquired by the Trust
on March 10, 2000 became  convertible  into Common Stock. As of October 2, 2000,
these notes are convertible  into 248,888 shares of Common Stock and warrants to
purchase  62,222  shares of Common  Stock for $.375 per share which  amounts are
subject to adjustment  should the Company request  additional  funding under the
terms of the Securities Purchase Agreement.

     On October 2, 2000,  pursuant  to a request for  additional  funding by the
Company under the Securities  Purchase  Agreement,  Circle F purchased 1,333,334
shares of unregistered Series A Convertible  Preferred Stock for $500,000 ($.375
per share) which  preferred  shares are  convertible  into  1,333,334  shares of
common stock.

     (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.


October 3, 2000                         /s/ Hayden R. Fleming
     Date                               ----------------------------------------
                                        Hayden R. Fleming
                                        Name/Title


                                        Circle F Ventures LLC

October 3, 2000                         By /s/ Hayden R. Fleming
     Date                                 --------------------------------------
                                        Hayden R. Fleming - Managing Member
                                        Name/Title


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