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Patente citante Fecha de presentación Fecha de emisión Cesionario original Título
US668185922 Oct 200127 Ene 2004Downhole oil and gas well heating system and method
US706999323 Ene 20044 Jul 2006Down hole oil and gas well heating system and method for down hole heating of oil and gas wells
US736397924 Ene 200529 Abr 2008Down hole oil and gas well heating system and method for down hole heating of oil and gas wells
US75436436 Dic 20059 Jun 2009Down hole oil and gas well heating system and method for down hole heating of oil and gas wells