Assignment of Assignor's Interest

Recorded: 2004-12-22 Pages: 3

Assignor

LIVINGSTONE, JAMES I.

Executed: 2004-12-20

Assignee

PRESSSOL LTD

8 LAKE PLACID BAY S.E., CALGARY, T2J 5A6, CANADA

Covered Properties (5)

Two String Drilling System

Patent: 6,892,829 →

Application: 10/346,125 →

Publication: US 2003/0173088

Two String Drilling System Using Coil Tubing

Patent: 6,854,534 →

Application: 10/347,861 →

Publication: US 2003/0155156

Reverse Circulation Clean Out System for Low Pressure Gas Wells

Patent: 7,090,018 →

Application: 10/622,582 →

Publication: US 2004/0104030

Reverse Circulation Directional and Horizontal Drilling Using Concentric Drill String

Patent: 7,204,327 →

Application: 10/644,748 →

Publication: US 2004/0079553

Reverse Circulation Directional and Horizontal Drilling Using Concentric Coil Tubing

Patent: 7,066,283 →

Application: 10/644,749 →

Publication: US 2004/0104052