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Patentes

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Patente citante Fecha de presentación Fecha de emisión Cesionario original Título
US459242110 Sep 19843 Jun 1986Bayer AktiengesellschaftSucker rods
US471696014 Jul 19865 Ene 1988Production Technologies International, Inc.Method and system for introducing electric current into a well
US614270727 Ago 19977 Nov 2000Shell Oil CompanyDirect electric pipeline heating
US617102526 Mar 19969 Ene 2001Shell Oil CompanyMethod for pipeline leak detection
US617952326 Mar 199630 Ene 2001Shell Oil CompanyMethod for pipeline installation
US626061525 Jun 199917 Jul 2001Baker Hughes IncorporatedMethod and apparatus for de-icing oilwells
US626440126 Mar 199624 Jul 2001Shell Oil CompanyMethod for enhancing the flow of heavy crudes through subsea pipelines
US631549723 Dic 199713 Nov 2001Shell Oil CompanyJoint for applying current across a pipe-in-pipe system
US668674520 Jul 20013 Feb 2004Shell Oil CompanyApparatus and method for electrical testing of electrically heated pipe-in-pipe pipeline
US668890025 Jun 200210 Feb 2004Shell Oil CompanyInsulating joint for electrically heated pipeline
US670701220 Jul 200116 Mar 2004Shell Oil CompanyPower supply for electrically heated subsea pipeline
US671401820 Jul 200130 Mar 2004Shell Oil CompanyMethod of commissioning and operating an electrically heated pipe-in-pipe subsea pipeline
US673980320 Jul 200125 May 2004Shell Oil CompanyMethod of installation of electrically heated pipe-in-pipe subsea pipeline
US681414620 Jul 20019 Nov 2004Shell Oil CompanyAnnulus for electrically heated pipe-in-pipe subsea pipeline
US69370308 Nov 200230 Ago 2005Shell Oil CompanyTesting electrical integrity of electrically heated subsea pipelines
US710806325 Sep 200119 Sep 2006Connectable rod system for driving downhole pumps for oil field installations
US759684712 Jul 20066 Oct 2009Connectable rod system for driving downhole pumps for oil field installations

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