Patent Assignment
Reel/Frame 004424/0463
Assignment of Assignors Interest.
Recorded: 1985-06-21
Pages: 2
Assignor
GEARHART INDUSTRIES, INC.
Executed: 1984-07-10
Covered Property
(1)
Early Gas Detection System for a Drill Stem Test
Patent:
4,392,377 →
Application:
06/305,947 →
Related Assignments
(3)
Other recorded transfers of the patent in this record — the chain of ownership.
Assignment of Assignors Interest.
Sep 28, 1981
From: RANKIN, E. EDWARD
To: GEARHART INDUSTRIES, INC., A CORP. OF TX.
Reel/Frame 003932/0356 →
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 →