Patent Assignment
Reel/Frame 004491/0590
Assignment of Assignors Interest.
Recorded: 1981-07-17
Pages: 2
Assignors
VANN, ROY R.
Executed: 1981-07-06
RIBBLE, GEORGE W.
Executed: 1981-07-06
GEORGE, FLINT R.
Executed: 1981-07-06
Covered Property
(1)
Pressure Actuated Vent Assembly for Slanted Wellbores
Patent:
4,330,039 →
Application:
06/166,547 →
Related Assignments
(3)
Other recorded transfers of the patent in this record — the chain of ownership.
Assignment of Assignors Interest.
May 16, 1986
From: PEABODY INTERNATIONAL CORPORATION
To: GEO INTERNATIONAL CORPORATION
Reel/Frame 004555/0052 →
Change of Name
Aug 28, 1986
From: GEO VANN, INC.
To: VANN SYSTEMS INC.
Reel/Frame 004606/0291 →
Merger
Aug 28, 1986
From: VANN SYSTEMS, INC.
To: HALLIBURTON COMPANY
Reel/Frame 004606/0300 →