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David R Parrish: Method for enhanced oil recovery. Standard Oil Company, Scott H Brown, Fred E Hook, August 17, 1982: US04344486 (131 worldwide citation)

Disclosed is a method and apparatus for the enhanced recovery of liquid hydrocarbons from underground formations, said method comprising recovering a mixture comprising carbon dioxide and contaminants comprising hydrocarbon, hydrogen sulfide, or mixtures thereof, from an underground formation; combu ...


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David R Parrish: Tracers in predetermined concentration ratios. Standard Oil Company, Albert C Metrailer, Arthur McIlroy, October 25, 1977: US04055399 (22 worldwide citation)

A method for tracing the flow of a plurality of fluid slugs injected into a subsurface formation using a number of tracers smaller than the number of fluid slugs. Single tracers are used in a number of fluid slugs equal to the number of tracers. In the remaining injected fluid slugs, combinations of ...


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David R Parrish: Method for selective plugging of depleted channels or zones in in situ oil shale retorts. Standard Oil Company, Thomas W Tolpin, William T McClain, William H Magidson, February 14, 1984: US04431055 (3 worldwide citation)

Depleted zones or channels in in situ retorts that bypass unretorted zones can be plugged selectively by contacting the depleted zones in the in situ oil shale retort with an aqueous liquid, substantially free of a formation plugging amount of a solute, to increase the resistance of the depleted zon ...


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Leo Berger, Alfred J Corraz, David R Parrish, John W Scott: Hydroxy methyl carbazole acetic acid and esters. Hoffmann La Roche, Jon S Saxe, George M Gould, William G Isgro, April 17, 1979: US04150031 (3 worldwide citation)

A process for the preparation of 6-chloro-.alpha.-methylcarbazole-2-acetic acid from 6-chloro-.alpha.-hydroxy-.alpha.-methylcarbazole-2-acetic acid and/or 6-chloro-.alpha.-methylene-2-carboxylic acid, is described. The preparation of intermediates, such as, 6-chloro-.alpha.-hydroxy-.alpha.-methylcar ...


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Bruce W Gash, Luis E Arri, Elton B Hunt Jr, David R Parrish: Method of producing synthesis gas by underground gasification of coal using specific well configuration. Amoco Corporation, F E Hook, R R Cochran, T H Briggs, March 10, 1987: US04648450 (2 worldwide citation)

Underground coal gasification process containing a novel system of injection and production wells. Specifically, the injection well is positioned at an angle with respect to horizontal of less than the angle of repose of loose coal and char for the particular coal seam, and the production well is po ...


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Zoltan G Hajos, David R Parrish: Asymmetric synthesis of organic compounds. Hoffmann La Roche, Samuel L Welt, George M Gould, Raymond R Wittekind, August 8, 1978: US04105696 (1 worldwide citation)

Optically active organic compounds are prepared starting from optically inactive reactants by means of an optically active agent which influences the course of the reaction. In particular optically active compounds having a "meso" type carbon atom undergo an intramolecular ring closure in the presen ...


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Leo Berger, Alfred J Corraz, David R Parrish, John W Scott: Carbazole acetic acid derivatives. Hoffmann La Roche, Jon S Saxe, George M Gould, William G Isgro, December 11, 1979: US04178289 (1 worldwide citation)

A process for the preparation of 6-chloro-.alpha.-methylcarbazole-2-acetic acid from 6-chloro-.alpha.-hydroxy-.alpha.-methylcarbazole-2-acetic acid and/or 6-chloro-.alpha.-methylene-2-carboxylic acid, is described. The preparation of intermediates, such as, 6-chloro-.alpha.-hydroxy-.alpha.-methylcar ...


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David R Parrish, Zoltan G Hajos: Substituted-hydroxytetrahydroindanones. Hoffmann La Roche, Jon S Saxe, George M Gould, James H Callwood, February 19, 1980: US04189447

Optically active organic compounds are prepared starting from optically inactive reactants by means of an optically active agent which influences the course of the reaction. In particular optically active compounds having a "meso" type carbon atom undergo an intramolecular ring closure in the presen ...