IP Library › Assignment 004112/0800
Patent Assignment
Reel/Frame 004112/0800

Assignment of Assignors Interest.

Recorded: 1983-03-31 Pages: 1
Assignor
KROL, DAVID A.
Executed: 1983-03-16
Assignee
Covered Property (1)
Method of Freeing Stuck Drill String Using Spotting Fluid
Patent: 4,491,181 →
Application: 06/480,877 →
Related Assignments (1)
Other recorded transfers of the patent in this record — the chain of ownership.
Assignment of Assignors Interest. May 5, 1986
From: GULF RESEARCH AND DEVELOPMENT COMPANY, A CORP. OF DE.
To: CHEVRON RESEARCH COMPANY, SAN FRANCISCO, CA. A CORP. OF DE.
Reel/Frame 004610/0801 →