<PAGE>
===============================================================================
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13D
Under the Securities Exchange Act of 1934
(Amendment No. ____)*
THORATEC LABORATORES CORPORATION
- --------------------------------------------------------------------------------
(Name of Issuer)
COMMON STOCK
- --------------------------------------------------------------------------------
(Title of Class of Securities)
885175307
- --------------------------------------------------------------------------------
(CUSIP Number)
JAMES R. McGOOGAN, P.O. BOX 1938, PALM CITY, FL 34991-6938 561-220-4333
- --------------------------------------------------------------------------------
(Name, Address and Telephone Number of Person Authorized to Receive Notices and
Communications)
MAY 28, 1998
- --------------------------------------------------------------------------------
(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 the 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
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).
(Continued on following pages)
Page 1 of 6 pages
<PAGE>
SCHEDULE 13D
- ----------------------- ---------------------
CUSIP NO. 885175307 PAGE 2 OF 6 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
BRADLEY RESOURCES COMPANY
16-1224523
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [X]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
SOURCE OF FUNDS*
4
WC
- ------------------------------------------------------------------------------
CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
TO ITEMS 2(d) or 2(e) [_]
5
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
6
ORGANIZED UNDER THE LAWS OF THE STATE OF NEW YORK
- ------------------------------------------------------------------------------
SOLE VOTING POWER
7
NUMBER OF 0
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 8
1,181,221
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
9
REPORTING 0
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 10
1,181,221
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
1,181,221
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
5.8%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
14
PN
- ------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
SCHEDULE 13D
- ----------------------- ---------------------
CUSIP NO.885175307 PAGE 3 OF 6 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
GEORGE W. HOLBROOK, JR.
###-##-####
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [X]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
SOURCE OF FUNDS*
4
WC
- ------------------------------------------------------------------------------
CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
TO ITEMS 2(d) or 2(e) [_]
5
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
6
USA
- ------------------------------------------------------------------------------
SOLE VOTING POWER
7
NUMBER OF 0
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 8
1,181,221
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
9
REPORTING 0
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 10
1,181,221
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
1,181,221
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
5.8%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
14
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
SCHEDULE 13D
- ----------------------- ---------------------
CUSIP NO. 885175307 PAGE 4 OF 6 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
JAMES R. McGOOGAN
###-##-####
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [X]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
SOURCE OF FUNDS*
4
WC
- ------------------------------------------------------------------------------
CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
TO ITEMS 2(d) or 2(e) [_]
5
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
6
USA
- ------------------------------------------------------------------------------
SOLE VOTING POWER
7
NUMBER OF 0
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 8
1,181,221
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
9
REPORTING 0
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 10
1,181,221
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
1,181,221
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
5.8%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
14
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
SCHEDULE 13D
- ----------------------- ---------------------
CUSIP NO. 885175307 PAGE 5 OF 6 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
RICHARD V. TRAISTER
###-##-####
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [X]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
SOURCE OF FUNDS*
4
WC
- ------------------------------------------------------------------------------
CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
TO ITEMS 2(d) or 2(e) [_]
5
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
6
USA
- ------------------------------------------------------------------------------
SOLE VOTING POWER
7
NUMBER OF 0
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 8
1,181,221
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
9
REPORTING 0
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 10
1,181,221
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
1,181,221
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
5.8%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
14
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
Bradley Resources Company, a New York general partnership of which George
W. Holbrook, Jr., James R. McGoogan and Richard V. Traister are the general
partners, hereby files Schedule 13D.
After reasonable inquiry and to the best of our knowledge and belief, we
certify that the information set forth in this statement is true, complete and
correct.
/s/ James R. McGoogan
--------------------------------------
Bradley Resources Company (Partner)
/s/ George W. Holbrook, Jr.
--------------------------------------
George W. Holbrook, Jr.
/s/ James R. McGoogan
--------------------------------------
James R. McGoogan
/s/ Richard V. Traister
--------------------------------------
Richard V. Traister
