Wenzel Downhole Tools Ltd. v. National-Oilwell Canada Ltd., 2011 FC 1323

  • November 29, 2011

Date: 2011-11-29 Snider J.  | Link

A patent dispute about a bearing assembly intended for use in the drilling of oil and gas wells. Plaintiff applied for a patent in October 1990. Defendant proves that their use of the bearing assembly in dispute pre-dated the patent, based on metadata associated with a CAD file stating that the drawing was created in September 1989 (para 111).