Patent Assignment
Reel/Frame 022023/0013
Assignment of Assignor's Interest
Recorded: 2008-12-23
Pages: 3
Assignor
WESTERN OIL SANDS USA, INC.
Executed: 2008-11-30
Assignee
MARATHON OIL CANADA CORPORATION
440 - SECOND AVENUE, S.W., ERNST & YOUNG TOWER, SUITE 2400, CALGARY, ALBERTA, T2P 5E9, CANADA
Covered Property
(1)
Processing Asphaltene-Containing Tailings
Related Assignments
(3)
Other recorded transfers of the patent in this record — the chain of ownership.
Assignment of Assignor's Interest
Jun 5, 2006
From: DUYVESTEYN, WILLEM P.C.; KIFT, JULIAN; MORLEY, RAYMOND L.
To: WESTERN OIL SANDS USA, INC.
Reel/Frame 017736/0950 →
Assignment of Assignor's Interest
Apr 30, 2012
From: MARATHON OIL CANADA CORPORATION
To: SHELL CANADA ENERGY
Reel/Frame 028128/0322 →
Nunc Pro Tunc Assignment
Feb 27, 2018
From: SHELL CANADA ENERGY
To: CANADIAN NATURAL UPGRADING LIMITED
Reel/Frame 045054/0463 →