Patent Assignment
Reel/Frame 005153/0459
Assignment of Assignors Interest.
Recorded: 1989-09-29
Pages: 2
Assignee
E.I. DU PONT DE NEMOURS & COMPANY
1007 MARKET STREET, WILMINGTON, DELAWARE, 19898
Covered Property
(1)
Mud Saver Valve with Increased Flow Check Valve
Patent:
4,955,949 →
Application:
07/305,319 →
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 →