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Patente citante Fecha de presentación Fecha de emisión Cesionario original Título
US519755314 Ago 199130 Mar 1993Atlantic Richfield CompanyDrilling with casing and retrievable drill bit
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Shell Oil Company
Retractable joint and cementing shoe for use in completing a wellbore
US785705211 May 200728 Dic 2010Weatherford/Lamb, Inc.Stage cementing methods used in casing while drilling
US789144022 Feb 200822 Feb 2011Method and system for installing geothermal transfer apparatuses with a sonic drill and a removable or retrievable drill bit
US793820128 Feb 200610 May 2011Weatherford/Lamb, Inc.Deep water drilling with casing
US807474013 Dic 201013 Dic 2011Method and system for installing cast-in-place concrete piles with a sonic drill and a removable or retrievable drill bit
US811811518 Feb 200921 Feb 2012Method and system for installing geothermal heat exchangers, micropiles, and anchors using a sonic drill and a removable or retrievable drill bit
USRE428779 Jul 20101 Nov 2011Weatherford/Lamb, Inc.Methods and apparatus for wellbore construction and completion