Patent Assignment
Reel/Frame 004432/0563
Assignment of Assignors Interest.
Recorded: 1985-07-18
Pages: 2
Assignor
HELFER, PAUL E.
Executed: 1985-07-12
Assignee
Covered Property
(1)
Valve Apparatus
Patent:
4,638,972 →
Application:
06/756,187 →
Related Assignments
(3)
Other recorded transfers of the patent in this record — the chain of ownership.
Assignment of Assignor's Interest
May 5, 1995
From: PB BOP, INC.
To: COOPER INDUSTRIES, INC.
Reel/Frame 007467/0471 →
Assignment of Assignor's Interest
May 5, 1995
From: COOPER INDUSTRIES, INC.
To: COOPER CAMERON CORPORATION
Reel/Frame 007467/0566 →
Assignment of Assignor's Interest
May 5, 1995
From: FIRST CITY NATIONAL BANK OF HOUSTON, N.A.
To: PB BOP, INC.
Reel/Frame 007467/0645 →