Patent Assignment
Reel/Frame 003903/0808
Assignment of Assignors Interest.
Recorded: 1981-06-15
Pages: 1
Assignor
HELZER, LAWRENCE E.
Executed: 1981-06-01
Assignee
BJ-HUGHES INC.
P.O. BOX 2539, A CORP. OF DE, HOUSTON, TEXAS, 77001
Covered Property
(1)
Swivel Unit
Patent:
4,395,061 →
Application:
06/273,821 →
Related Assignments
(3)
Other recorded transfers of the patent in this record — the chain of ownership.
Assignment of Assignors Interest.
Feb 22, 1983
From: BJ-HUGHES INC.,
To: HUGHES TOOL COMPANY, A CORP. OF DEL.
Reel/Frame 004098/0273 →
Assignment of Assignors Interest.
Aug 8, 1988
From: HUGHES TOOL COMPANY
To: BAKER HUGHES INCORPORATED
Reel/Frame 005050/0861 →
Assignment of Assignors Interest.
Sep 25, 1991
From: BAKER HUGHES INCORPORATED
To: BJ SERVICES COMPANY
Reel/Frame 005852/0291 →