John M Forgac, George R Hoekstra: In situ retorting of oil shale with pulsed water purge. Amoco Corporation, Chevron U, Thomas W Tolpin, William T McClain, William H Magidson, January 20, 1987: US04637464 (257 worldwide citation)

Product yield and quality is increased during in situ retorting of oil shale by pulsed combustion in which the flow of feed gas to the flame front is intermittently stopped while continuously retorting the oil shale. In the process, a water purge is injected into the retort between pulses of feed ga ...

Shang Chou, Curtis B Campbell: Oil recovery method for waxy crude oil using alkylaryl sulfonate surfactants derived from alpha-olefins and the alpha-olefin compositions. Chevron U, Chevron Chemical Company, A Stephen Zavell, August 7, 2001: US06269881 (127 worldwide citation)

An oil recovery process is disclosed which uses a particular class of alkylaryl sulfonate surfactants. The surfactants are derived from an alpha-olefin stream having a broad distribution of even carbon numbers ranging from 12 to 58. The olefin stream is reacted with aromatic feedstock, such as benze ...

Jen Hwa Chen: Installation of a foundation pile in a subsurface soil. Chevron U, Rodney F Brown, September 14, 1999: US05951207 (92 worldwide citation)

A method is provided for installing a tubular member in a porous solid medium beneath the surface of a liquid body. The method is initiated by placing the member in a substantially upright position within the liquid body with an open end of the member positioned upon the solid medium and the opposit ...

James J Harrison, William R Ruhe Jr: Modified high molecular weight succinimides. Chevron Research and Technology Company a Division of Chevron U, E A Schaal, W K Turner, August 2, 1994: US05334321 (70 worldwide citation)

Alkenyl or alkyl succinimide additives which are the reaction product of a high molecular weight alkenyl- or alkyl-substituted succinic anhydride and a polyalkylene polyamine having an average of greater than 4 nitrogen atoms per mole, wherein the reaction product is post-treated with a cyclic carbo ...

Bruce E Reynolds, Fred W Lam, Julie Chabot, Fernando J Antezana, Robert Bachtel, Kirk R Gibson, Richard Threlkel, Pak C Leung: Upflow reactor system with layered catalyst bed for hydrotreating heavy feedstocks. Chevron U, Penny L Prater, James W Ambrosius, April 29, 2003: US06554994 (66 worldwide citation)

A reactor system and process for hydrotreating a heavy feedstock contaminated with metals sulfur and carbon residue using an upflow fixed bed reactor with at least two catalyst layers having different hydrogenation activity.

Stephen J Miller: Preparation of aluminosilicate zeolites. Chevron U, W K Turner, A W Klaassen, R J Sheridan, September 24, 1996: US05558851 (65 worldwide citation)

A method is disclosed for preparing a crystalline aluminosilicate zeolite from a reaction mixture containing only sufficient water so that the reaction mixture may be shaped if desired. In the method, the reaction mixture is heated at crystallization conditions and in the absence of an external liqu ...

Curtis L Munson, Laura C Boudreau, Michael S Driver, William L Schinski: Separation of olefins from paraffins using ionic liquid solutions. Chevron U, Burns Doane Swecker & Mathis L, January 15, 2002: US06339182 (61 worldwide citation)

Methods for separating olefins from non-olefins, such as parafins, including cycloparaffins, oxygenates and aromatics, are provided. The methods use metal salts to complex olefins, allowing the non-olefins to be separated by a variety of methods, including decantation and distillation. The metal sal ...

Steven H Peth: System and method for automated credit matching. Chevron U, Timothy J Hadlock, October 18, 2005: US06957192 (60 worldwide citation)

The invention includes a method of financing eCommerce purchases including: receiving over the Internet buyer registration information. Then evaluating a credit rating for the buyer and passing over the Internet the credit rating to a seller, and then receiving over the Internet from the seller sell ...

Douglas Francis Goff, Luc Vincent, Kevin L Deal, William S Kowalik, Sebastien Bombarde, Sandra Lee, William R Volz, Richard C Jones: Process for interpreting faults from a fault-enhanced 3-dimensional seismic attribute volume. Chevron U, Richard J Schulte, June 27, 2006: US07069149 (60 worldwide citation)

A computer implemented method for interpreting faults from a fault-enhanced 3-D seismic attribute cube. The method includes the steps of extracting faults from a 3-D seismic attribute cube, and of calculating a minimum path value for each voxel of the 3-D seismic attribute cube. A fault network skel ...

Willard J Sevigny, Donald L Kuehne, Jeremy Cantor: Enhanced oil recovery method employing a high temperature brine tolerant foam-forming composition. Chevron Research and Technology Company a Division of Chevron U, E A Schaal, W K Turner, October 25, 1994: US05358045 (57 worldwide citation)

An enhanced oil recovery technique for recovering hydrocarbons from a reservoir during gas injection comprises the at least periodic injection of gas and a foam-forming composition into the reservoir. The foam-forming composition comprises water, an effective foam-forming amount of a C.sub.10-16 .al ...