AMENDMENT NO. 1
TO
SCHEDULE 13D
ON
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
MOLECULAR BIOSYSTEMS, INC.
(NAME OF ISSUER)
COMMON STOCK, $0.01 PAR VALUE
(TITLE OF CLASS OF SECURITIES)
608513 10 7
(CUSIP NUMBER)
(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)
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CUSIP No. 608513 10 7
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(1) Names of Reporting Persons: Mallinckrodt Inc.
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S.S. or I.R.S. Identification Number: 36-1263901
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(2) Check the Appropriate Box if a Member (a)
--------------------------------
of a Group (See Instructions)
(b)
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(3) OTS Use Only
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(4) Citizenship or Place of Organization: New York
Number of Shares (5) Sole Voting
Beneficially Owned Power -0-
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By Each Reporting
Person With (6) Shared Voting
Power 1,300,579
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(7) Sole Dispositive
Power
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(8) Shared Dispositive
Power 1,300,579
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(9) Aggregate Amount Beneficially Owned by
Each Reporting Person: 1,300,579
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(10) Check if the Aggregate Amount in Row (9)
Excludes Certain Shares (See Instructions)
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(11) Percent of Class Represented by Amount
in Row (9) 6.9%
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(12) Type of Reporting Person
(See Instructions) CO
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CUSIP No. 608513 10 7
(1) Names of Reporting Persons: Mallinckrodt Inc.
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S.S. or I.R.S. Identification Number: 43-1479062
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(2) Check the Appropriate Box if a Member (a)
--------------------------------
of a Group (See Instructions)
(b)
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(3) OTS Use Only
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(4) Citizenship or Place of Organization: Delaware
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Number of Shares (5) Sole Voting
Beneficially Owned Power -0-
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By Each Reporting
Person With (6) Shared Voting
Power 1,300,579
(7) Sole Dispositive
Power
(8) Shared Dispositive
Power 1,300,579
- --------------------------------------------------------------------------------
(9) Aggregate Amount Beneficially Owned by
Each Reporting Person: 1,300,579
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(10) Check if the Aggregate Amount in Row (9)
Excludes Certain Shares (See Instructions)
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(11) Percent of Class Represented by Amount
in Row (9) 6.9%
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(12) Type of Reporting Person
(See Instructions) CO
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SCHEDULE 13G
1(A) NAME OF ISSUER:
Molecular Biosystems, Inc.
1(B) ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
10030 Barnes Canyon Road
San Diego, CA 92121
ITEM 2(A)(I). NAME OF PERSON FILING
Mallinckrodt Inc.
ITEM 2(B)(I). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
675 McDonnell Boulevard
St. Louis, MO 63134
ITEM 2(C)(I) CITIZENSHIP
New York
ITEM 2(A)(II) NAME OF PERSON FILING
Mallinckrodt Inc.
ITEM 2(B)(II). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
675 McDonnell Boulevard
St. Louis, MO 63134
ITEM 2(C)(II) CITIZENSHIP
Delaware
ITEM 2(D). TITLE OF CLASS OF SECURITIES
Common Stock, $0.01 par value
ITEM 2(E). CUSIP NO.
608513 10 7
ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULE 13D-1(B) OR 13D-2(B),
CHECK WHETHER THE PERSON FILING IS A:
(a) |_|Broker or Dealer registered under Section 15 of the Act
(b) |_|Bank as defined in Section 3(a)(6) of the Act
(c) |_|Insurance Company as defined in Section 3(a)(19) of the
Act
(d) |_|Investment Company registered under Section 8 of the
Investment Company Act
(e) |_|Investment Adviser registered under Section 203 of the
Investment Advisers Act of 1940
(f) |_|Employee Benefit Plan, Pension Fund which is subject to the
provisions of the Employee Retirement Income Security Act of 1974
or Endowment Fund; see ss.240.13d-1(b)(1)(ii)(F)
(g) |_|Parent Holding Company, in accordance with
ss.240.13d-1(b)(ii)(G) (Note: See Item 7)
(h) |_|Group, in accordance withss.240.13d-1(b)(1)(ii)(H)
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ITEM 4. OWNERSHIP
(a)-(c)As of May 15, 2000, the Reporting Persons beneficially owned the
number and percentage of Shares of the Issuer set forth below:
Number of Percentage Sole Voting Shared Sole Shared
Shares of Power Voting Power Dispositive Dispositive
------ Outstanding ----- ------------ Power Power
Shares1 ----- -----
-------
1,300,579 6.9% -0- 1,300,579 -0- 1,300,579
ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS
Not applicable.
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
Mallinckrodt Inc., a Delaware corporation, is a wholly-owned
subsidiary of Mallinckrodt Inc., a New York corporation.
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 acquired in the ordinary course of
business and were not acquired for the purpose of and do not have the effect of
changing or influencing the control of the issuer of such securities and were
not acquired in connection with or as a participant in any transaction having
such purposes or effect.
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1 Based upon information contained in the Issuer's Form 10-Q for the quarter
ended December 31, 1999, the number of shares of Common Stock issued and
outstanding as of December 31, 1999 was 18,724,017
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SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I the
undersigned certify that the information set forth in this statement is true,
complete and correct.
Date: May 15, 2000 Mallinckrodt Inc., a New York
corporation
By: /s/ Roger A. Keller
Name: Roger A. Keller
Title: Vice President, Secretary
and General Counsel
Date: May 15, 2000 Mallinckrodt Inc., a Delaware
corporation
By: /s/ Roger A. Keller
Name: Roger A. Keller
Title: Vice President, Secretary
and General Counsel
