1
Donald J Anderson, Charles F Kirkvold, Peter Pisio: Method of recovering viscous petroleum from tar sand. Chevron Research Company, R L Freeland Jr, Edward J Keeling, November 30, 1976: US03994340 (275 worldwide citation)

Recovery of viscous petroleum such as from tar sands is assisted using a substantially vertical passage from the earth's surface which penetrates the tar sand and has extending therefrom a lateral hole containing a flow path isolated from the tar sand for circulating a hot fluid to and from the vert ...


2
Donald J Anderson, Charles F Kirkvold, Peter Pisio, John R Lishman: Recovering viscous petroleum from thick tar sand. Chevron Research Company, R L Freeland Jr, Edward J Keeling, November 30, 1976: US03994341 (255 worldwide citation)

Recovery of viscous petroleum such as from thick tar sands is assisted using a closed-loop flow path from the earth's surface through a substantial portion of the formation for conducting hot fluid to reduce the viscosity of the petroleum in the formation to develop a potential passage in the format ...


3
Peter Pisio, Charles F Kirkvold: System for recovering viscous petroleum from thick tar sand. Chevron Research Company, E J Keeling, R L Freeland Jr, April 26, 1977: US04019575 (245 worldwide citation)

Recovery of viscous petroleum such as from thick tar sands is assisted using a closed-loop flow path formed in a well by concentric casing and tubular members extending from the earth's surface through a substantial portion of the formation for conducting hot fluid to reduce the viscosity of the pet ...


4
Theodore R Blevins: Arrangement of wells for producing subsurface viscous petroleum. Chevron Research Company, J A Buchanan Jr, R L Freeland Jr, G W Wasson, December 1, 1981: US04303126 (202 worldwide citation)

A method is disclosed for recovering viscous crudes from petroleum-containing formation, such as tar sand deposits, which are too deep to mine economically but not deep enough, or geologically not structured properly, to successfully hydraulically fracture for well to well production. The method con ...


5
Donald J Anderson: Method of recovering viscous petroleum from an underground formation. Chevron Research Company, R L Freeland Jr, Edward J Keeling, July 26, 1977: US04037658 (173 worldwide citation)

Recovery of viscous petroleum such as from tar sands is assisted using a controlled flow of hot fluid in a flow path within the formation but out of direct contact with the viscous petroleum; thus a solid-wall, hollow tubular member in the formation is used for conducting hot fluid to reduce the vis ...


6
Stanley O Hutchison, Glenn W Anderson: Steam injection system for use in a well. Chevron Research Company, R L Freeland Jr, Edward J Keeling, July 11, 1978: US04099563 (99 worldwide citation)

A steam injection system including a steam deflector connectable into a tubing string which steam deflector provides for selectively passing steam through the tubing string to the bottom thereof or diverting steam from inside the tubing string out into the wall liner-tubing annulus and in a directio ...


7
Lewis M Fraas: Multilayer photovoltaic solar cell with semiconductor layer at shorting junction interface. Chevron Research Company, R L Freeland Jr, G W Wasson, March 10, 1981: US04255211 (92 worldwide citation)

A new high efficiency, multijunction photovoltaic solar cell for use with a concentration lens. This cell comprises an elemental single crystal substrate without an internal light sensitive junction, upon which are two or more successive homogenous layers of semiconductor materials, each layer conta ...


8
Peter Pisio, Charles F Kirkvold: Arrangement for recovering viscous petroleum from thick tar sand. Chevron Research Company, Edward J Keeling, R L Freeland Jr, May 3, 1977: US04020901 (73 worldwide citation)

An arrangement is provided for recovering viscous oil from a tar sand formation having a large vertical dimension including a substantially vertical lined shaft extending through the tar sand formation. A first opening is formed in the lower portion of the shaft lining and at least one lateral hole ...


9
Leo Rosenthal, Leonard M Isaacson, John A Ziebarth: Computer-aided graphics system including a computerized material control system and method of using same. Chevron Research Company, R L Freeland Jr, H D Messner, January 1, 1980: US04181954 (43 worldwide citation)

Description is hereinafter had to a digital computer-aided graphics system for producing in a plane having two-dimensional coordinate axes a planar representation of a three-dimensional pipeline described in easy-to-understand coded input format as a series of workpoints paired into overlapping sets ...


10
Per Baardsen: Offshore structure for use in waters containing large moving ice masses. Chevron Research Company, R L Freeland Jr, William J Egan III, August 5, 1980: US04215952 (39 worldwide citation)

An offshore structure for use in arctic waters containing large moving ice masses such as icebergs wherein the structure has a wear surface arranged around the periphery of its support portion at least in the region of the support portion of potential contact with moving ice masses. A layer of resil ...