BackDate of JudgmentJuly 18, 2011Issuing AuthorityFederal Court of AppealLevel of the Issuing AuthorityAppellate InstanceType of ProcedureJudicial (Civil)Subject MatterPatents (Inventions)Plaintiff/AppellantWeatherford Canada Ltd., Weatherford Canada Partnership, Edward Grenke, and GrenCo Industries Ltd.Defendant/RespondentCorlac Inc., National-Oilwell Canada Ltd., and National Oilwell IncorporatedKeywords
Prior use,
Induced infringement,
Defences to infringement,
Anticipation (Novelty),
Oil and gas,
Mechanical