1
William E Showalter, Elihu Goldish, Ronald J Lukasiewicz: Oil tracing method. Union Oil Company of California, Howard Lambert, G Wirzbicki, D Sandford, July 5, 1988: US04755469 (25 worldwide citation)

A method for tagging an oil so that subsequently it may be identified as to source by incorporating into the oil as a tracer material an oil-soluble or oil-dispersible Group VIB, Group VIIB or lanthanum series rare earth metal salt of a fatty acid. The so-tagged oil may be utilized in any desired ma ...


2
Eugene C Lin: Enhanced oil recovery using a three-stage injection of solvent and water. Union Oil Company of California, Gregory F Wirzbicki, Howard Lambert, Walter A Hackler, July 18, 1989: US04848466 (7 worldwide citation)

A three-stage, hybrid solvent and water injection process is provided for the enhanced oil recovery from an oil-bearing formation. The three-stage process includes the sequential steps of: (i) injecting part of a selected total amount of solvent into the formation in a "single slug" injection stage, ...