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Patente citante Fecha de presentación Fecha de emisión Cesionario original Título
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US543327029 Abr 199418 Jul 1995LaFleur Petroleum Services, Inc.Cementing plug
US54353867 Nov 199425 Jul 1995LaFleur Petroleum Services, Inc.Cementing plug
US546406212 Oct 19947 Nov 1995Weatherford U.S., Inc.Metal-to-metal sealable port
US671215327 Jun 200130 Mar 2004Weatherford/Lamb, Inc.Resin impregnated continuous fiber plug with non-metallic element system
US703660214 Jul 20032 May 2006Weatherford/Lamb, Inc.Retrievable bridge plug
US71248318 Abr 200524 Oct 2006Weatherford/Lamb, Inc.Resin impregnated continuous fiber plug with non-metallic element system
US734110520 Jun 200611 Mar 2008Holcim (US) Inc.Cementitious compositions for oil well cementing applications
US738982331 Ene 200624 Jun 2008Weatherford/Lamb, Inc.Retrievable bridge plug
US752768819 Dic 20075 May 2009Holcim (US) Inc.Cementitious compositions for oil well cementing applications
US777992723 Dic 200924 Ago 2010Weatherford/Lamb, Inc.Non-metallic mandrel and element system
US777992823 Dic 200924 Ago 2010Weatherford/Lamb, Inc.Non-metallic mandrel and element system
US778913523 Dic 20097 Sep 2010Weatherford/Lamb, Inc.Non-metallic mandrel and element system
US778913623 Dic 20097 Sep 2010Weatherford/Lamb, Inc.Non-metallic mandrel and element system
US778913723 Dic 20097 Sep 2010Weatherford/Lamb, Inc.Non-metallic mandrel and element system
US790910922 Oct 200722 Mar 2011Tesco CorporationAnchoring device for a wellbore tool
US800203023 Jun 200823 Ago 2011Weatherford/Lamb, Inc.Retrievable bridge plug