<PAGE>
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13D
Under the Securities Exchange Act of 1934
(Amendment No. 4)*
Oxboro Medical International, Inc.
----------------------------------
(Name of Issuer)
Common Stock, $0.01 Par Value
------------------------------
(Title of Class of Securities)
691384 20 0
(CUSIP Number)
Girard P. Miller
Lindquist & Vennum P.L.L.P.
4200 IDS Center
80 South Eighth Street
Minneapolis, Minnesota 55402
Telephone: (612) 371-2467
-------------------------
(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)
September 28 and October 28 and 29, 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 that is the subject of this Schedule 13D, and is filing this
schedule because of Sections 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 the schedule, including all exhibits. See Rule 13d-7 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).
(Continued on following page(s))
Page 1 of 5 Pages
<PAGE>
CUSIP No. 691384 20 0
- ------------------------------------------------------------------------------
1 NAME OF REPORTING PERSON
I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (entities only)
Kenneth W. Brimmer
(FEIN Not required)
- -------------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
(a)
(b)
- -------------------------------------------------------------------------------
3 SEC USE ONLY
- -------------------------------------------------------------------------------
4 SOURCE OF FUNDS (See instructions) 00 (Cash Reserves)
- -------------------------------------------------------------------------------
5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
TO ITEMS 2(d) or 2(e) / /
- -------------------------------------------------------------------------------
6 CITIZENSHIP OR PLACE OF ORGANIZATION
Mr. Brimmer is a citizen of the United States and a resident of the
State of Minnesota.
- -------------------------------------------------------------------------------
7 SOLE VOTING POWER
64,000
NUMBER OF ---------------------------------------------------------
SHARES 8 SHARED VOTING POWER
BENEFICIALLY 72,000
OWNED BY ---------------------------------------------------------
EACH 9 SOLE DISPOSITIVE POWER
REPORTING 64,000
PERSON ---------------------------------------------------------
WITH 10 SHARED DISPOSITIVE POWER
72,000
- -------------------------------------------------------------------------------
11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
136,000
- -------------------------------------------------------------------------------
12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
(See instructions) /X/
- -------------------------------------------------------------------------------
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
According to the transfer agent for the Issuer, there were 885,020
shares of Common Stock outstanding at October 29, 1999. Assuming this
number of shares outstanding as of the date of the events which
require the filing of this schedule, the amount in Row 11 represents
14.8% of the Issuer's outstanding shares. These share amounts reflect
a 1-for-5 reverse stock split on the Issuer's shares, effective
August 13, 1999.
- -------------------------------------------------------------------------------
14 TYPE OF REPORTING PERSON (See instructions)
IN and 00 (IRA Account)
- -------------------------------------------------------------------------------
Page 2 of 5 Pages
<PAGE>
CUSIP No. 691384 20 0
Item 1. SECURITY AND ISSUER.
(a) Title of Class of Securities: Common Stock, $.01 par value
(the "Common Stock") and one-year Warrants immediately
exercisable for purchase of Common Stock (the "Warrants")
(b) Name of Issuer: Oxboro Medical International, Inc.
(c) Address of Issuer's Principal Executive Offices:
13828 Lincoln Street, N.E.
Ham Lake, MN 55304
Item 2. IDENTITY AND BACKGROUND.
(a) Name of Person Filing: Kenneth W. Brimmer (the "Reporting
Person"). This Schedule 13D also pertains to Jaye M. Snyder,
spouse of Kenneth W. Brimmer, and such shares are included
within the references herein.
(b) Business Address:
720 South Fifth Street
Hopkins, Minnesota 55343
(c) Principal Occupation or Employment: Business Manager
(d) Conviction in a criminal proceeding during the last five
years: No
(e) Subject, during the last five years, to a judgment, decree
or final order enjoining securities laws violations: No
(f) Citizenship: Mr. Brimmer is a citizen of the United States
and a resident of Minnesota.
Item 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.
Cash reserves.
Item 4. PURPOSE OF TRANSACTION.
As reported in Item 5(c) below, the Reporting Person acquired an
aggregate 102,000 shares of Common Stock and 34,000 Warrants for
purchase of Common Stock of the Issuer as of October 29, 1999. All of
the acquisitions resulted from the exercise of rights to purchase to
which the Reporting Person was entitled pursuant to a Rights Offering
described in the Issuer's registration statement on Form S-3 and
effected by the Issuer on September 1, 1999 (the "Rights Offering").
The acquisitions were made by the Reporting Person for investment
purposes.
Page 3 of 5 Pages
<PAGE>
(a) On July 22, 1999, as described in the Issuer's registration
statement on Form S-3, the Reporting Person has agreed to
exercise purchase rights in the Issuer's Rights Offering, to
the extent necessary to ensure the issuer satisfies the net
tangible asset requirement to continue to be listed on the
Nasdaq Smallcap Market.
Item 5. INTEREST IN SECURITIES OF ISSUER
(a) Number and Percentage of Class beneficially owned:
Pursuant to the Rights Offering effected by the Issuer, the
Reporting Person purchased an aggregate 102,000 shares of
Common Stock and 34,000 Warrants for purchase of Common
Stock. The 136,000 securities may be deemed beneficially
owned within the meaning of Rule 13d-3 of the Securities
Exchange Act of 1934 by the Reporting Person and this
represents 14.8% of the 885,020 shares of the Issuer
reported by the Issuer's transfer agent as outstanding at
October 29, 1999. All share amounts have been adjusted to
reflect a 1-for-5 reverse stock split effected by the Issuer
on August 13, 1999.
(b) For information on voting and dispositive power with respect
to the above listed shares, see Items 5-8 of the cover page.
(c) Recent transactions in Common Stock:
The Reporting Person purchased shares of Common Stock and
Warrants of the Issuer on the dates set forth below and made
such transactions pursuant to the Rights Offering effected
by the Issuer. Pursuant to the terms of the Rights Offering
and for each share held at August 20, 1999, the Reporting
Person was entitled to purchase two shares of Common Stock
and one immediately exercisable Warrant for purchase of one
share of Common Stock, at a purchase price of $2.50:
<TABLE>
<CAPTION>
Total
Date of Purchase No. of Shares No. of Warrants Purchase Price
---------------- ------------- --------------- --------------
<S> <C> <C> <C>
09/28/99 24,000 12,000 $30,000
09/28/99 4,000 8,000 $20,000
10/28/99 32,000 16,000 $40,000
10/29/99 8,000 4,000 $10,000
</TABLE>
Page 4 of 5 Pages
<PAGE>
(d) Ability to Direct the Receipt of Dividends or the Proceeds
of Sale of Securities:
Not applicable.
(e) Last Date on Which Reporting Person Ceased to be a
5% Holder:
Not applicable.
Item 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
TO SECURITIES OF THE ISSUER.
There are no contracts, arrangements, understandings or relationships
(legal or otherwise) among the persons named in Item 2 and between
such persons and any person with respect to any securities of the
Issuer, except that as described in the Issuer's Registration
Statement on Form S-3, the Reporting Person has agreed to exercise
purchase rights in the Issuer's Rights Offering, to the extent
necessary to ensure that the Issuer satisfies the net tangible asset
requirement to continue to be listed on the Nasdaq Smallcap Market.
In addition, the Reporting Person has an informal, unwritten,
non-binding understanding with Gary W. Copperud, (who is mentioned in
Item 5 above and who also is filing a Schedule 13(d)). Such
understanding, to date, is to the effect that each will try (but not
necessarily beforehand) to keep the other informed of any significant
purchases or sales which such person makes, and that each will share,
with the other, information concerning the Issuer, and requests for
information addresses to the Issuer, which might affect the valuation
of their respective investments.
Item 7. MATERIAL TO BE FILED AS EXHIBITS.
(a) Registration Statement on Form S-3 as amended of Oxboro Medical
International, Inc. filed on July 22, 1999 is incorporated by
reference herein.
SIGNATURE
After reasonable inquiry and to the best of its knowledge and belief,
the undersigned certifies that the information set forth in this statement is
true, complete and correct.
Dated: November 12, 1999.
/s/ Kenneth W. Brimmer
-----------------------------
Kenneth W. Brimmer
Page 5 of 5 Pages
