Patent Assignment
Reel/Frame 015819/0450
Change of Name
Recorded: 2004-09-22
Pages: 3
Assignor
COMPUTALOG LTD.
Executed: 2001-12-31
Assignee
PRECISION DRILLING TECHNOLOGY SERVICES GROUP, INC.
4200, 150 6TH AVENUE S.W., CALGARY, ALBERTA, T2P 3Y7, CANADA
Covered Property
(1)
Perforating Gun Firing Head with Vented Block for Holding Detonator
Related Assignments
(4)
Other recorded transfers of the patent in this record — the chain of ownership.
Change of Name
Mar 6, 2006
From: PRECISION DRILLING TECHNOLOGY SERVICES GROUP, INC.
To: PRECISION ENERGY SERVICES LTD.
Reel/Frame 017251/0762 →
Change of Name
Apr 21, 2006
From: PRECISION DRILLING TECHNOLOGY SERVICES GROUP INC.
To: PRECISION ENERGY SERVICES LTD.
Reel/Frame 017507/0063 →
Assignment of Assignor's Interest
Apr 24, 2006
From: PRECISION ENERGY SERVICES LTD.
To: PRECISION ENERGY SERVICES ULC
Reel/Frame 017519/0043 →
Assignment of Assignor's Interest
Apr 26, 2006
From: PRECISION ENERGY SERVICES ULC
To: WEATHERFORD CANADA PARTNERSHIP
Reel/Frame 017527/0191 →