Patent Assignment
Reel/Frame 006772/0238
Change of Name
Recorded: 1993-11-18
Pages: 6
Assignor
A-Z INTERNATIONAL TOOL CO., INC.
Executed: 1987-05-08
Assignee
DRILEX SYSTEMS, INC.
15151 SOMMERMEYER, HOUSTON, TEXAS, 77008
Covered Properties
(4)
Mud Retaining Valve
Patent:
4,128,108 →
Application:
05/789,018 →
Whipstock Setting Method and Apparatus
Patent:
4,397,355 →
Application:
06/268,482 →
Method of and Apparatus for Cutting and Recovering of Submarine Surface Casing
Patent:
4,550,781 →
Application:
06/617,746 →
Well String Cutting Apparatus
Patent:
4,646,826 →
Application:
06/759,737 →
Related Assignments
(9)
Other recorded transfers of the patents in this record — the chain of ownership.
Assignment of Assignors Interest.
May 29, 1981
From: MC LAMORE, ROY T.
To: MASCO CORPORATION
Reel/Frame 003893/0140 →
Assignment of Assignors Interest.
Mar 12, 1984
From: AMERICAN INTERNATIONAL TOOL CO., INC.
To: PATNET SPECIALTIES, INC.
Reel/Frame 004234/0258 →
Assignment of Assignors Interest.
Mar 12, 1984
From: PATENT SPECIALTIES, INC.
To: PARKO SERVICES, INC.
Reel/Frame 004234/0256 →
Assignment of Assignors Interest.
Oct 26, 1984
From: KAGLER, EDMOND JR.
To: A-Z INTERNATIONAL TOOL COMPANY, A TX CORP.
Reel/Frame 004318/0552 →
Assignment of Assignors Interest.
Mar 4, 1985
From: PARKO SERVICES, INC.
To: A-Z INTERNATIONAL TOOL COMPANY, A CORP OF TX
Reel/Frame 004368/0897 →
Assignment of Assignors Interest.
Jul 29, 1985
From: BAILEY, THOMAS F.; CAMPBELL, JOHN E.; SHAH, NEHAL M.
To: A-Z INTERNATIONAL TOOL COMPANY A CORP OF TX
Reel/Frame 004437/0373 →
Assignment of Assignors Interest.
Dec 21, 1987
From: MASCO CORPORATION
To: DRILEX SYSTEMS, INC.
Reel/Frame 004969/0240 →
Assignment of Assignor's Interest
Dec 3, 1993
From: DRILEX SYSTEMS, INC.
To: MASX ENERGY SERVICES GROUP, INC.
Reel/Frame 006782/0769 →
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 →