Patent Assignment
Reel/Frame 018075/0781
Assignment of Assignor's Interest
Recorded: 2006-07-25
Pages: 4
Assignor
ZHANG, KEWEI
Executed: 2006-06-29
Assignee
TRICAN WELL SERVICE LTD.
645-7TH AVENUE S.W., CALGARY, ALBERTA, T2P 4G8, CANADA
Covered Property
(1)
Fracturing with Viscoelastic Surfactant Based Fluid
Related Assignments
(2)
Other recorded transfers of the patent in this record — the chain of ownership.