Patent Assignment
Reel/Frame 004911/0748
Change of Name
Recorded: 1988-06-24
Pages: 3
Assignor
A-Z INTERNATIONAL TOOL COMPANY
Executed: 1987-05-08
Assignee
DRILEX SYSTEMS, INC.
NOT PROVIDED
Covered Property
(1)
Self-Lubricating Well Tools and Seal Elements Therefor
Patent:
4,793,424 →
Application:
07/020,260 →
Related Assignments
(2)
Other recorded transfers of the patent in this record — the chain of ownership.
Assignment of Assignor's Interest
Nov 18, 1993
From: DRILEX SYSTEMS, INC.
To: MASX ENERGY SERVICES GROUP, INC.
Reel/Frame 006767/0963 →
Assignment of Assignor's Interest
Jan 12, 1994
From: MASX ENERGY SERVICES GROUP, INC. (A DELAWARE CORPORATION)
To: SMITH INTERNATIONAL, INC. (A DELAWARE CORPORATION)
Reel/Frame 006822/0975 →