Patent Assignment
Reel/Frame 003932/0356
Assignment of Assignors Interest.
Recorded: 1981-09-28
Pages: 1
Assignor
RANKIN, E. EDWARD
Executed: 1981-09-22
Assignee
GEARHART INDUSTRIES, INC., A CORP. OF TX.
P.O. BOX 1936, FORT WORTH, TEXAS, 76140
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.
Jun 21, 1985
From: GEARHART INDUSTRIES, INC.
To: H-G TESTING OMPANY A JOINT VENTURE PARTNERSHIP COMPRISED OF HUGHES TESTING CORPORATION A DE CORP AND RANKIN ENTERPRISES, INC. A TX CORP
Reel/Frame 004424/0463 →
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 →