Patents by Inventor Kechia J. Chou

Kechia J. Chou has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of dehydrating organic oxygenates
    Patent number: 5456839
    Abstract: Aqueous solutions of organic oxygenates, such as ethylene glycol may be dehydrated by pervaporation through a poly(vinyl pyridine) membrane which has been quaternized and cross-linked.
    Type: Grant
    Filed: July 22, 1991
    Date of Patent: October 10, 1995
    Assignee: Texaco Inc.
    Inventor: Kechia J. Chou
  • Membrane separation process
    Patent number: 5281337
    Abstract: Membrane separation process is improved by use, as a support membrane, of (i) a polyacrylonitrile membrane on which at least a portion of the surface --CN groups have been hydrolyzed to --COOH groups or (ii) a membrane formed of polyacrylonitrile and polyacrylic acid.
    Type: Grant
    Filed: July 13, 1992
    Date of Patent: January 25, 1994
    Assignee: Texaco Inc.
    Inventors: Kechia J. Chou, Kathleen M. Hellmuth
  • Preparation of N-substituted-2-morpholone
    Patent number: 5206157
    Abstract: N-substituted dialkanolamine may be converted to N-substituted-2-morpholone by the action of Gluconobacter oxydan ATCC #621 or Gluconobacter roseus IAM 1841.
    Type: Grant
    Filed: September 28, 1988
    Date of Patent: April 27, 1993
    Assignee: Texaco Inc.
    Inventor: Kechia J. Chou
  • Membrane separation process
    Patent number: 5147549
    Abstract: Membrane separation process is improved by use, as a support membrane, of a polyacrylonitrile membrane the surface of which has been oxygen-plasma treated whereby at least a portion of the surface has been oxidized to --COOH groups.
    Type: Grant
    Filed: July 22, 1991
    Date of Patent: September 15, 1992
    Assignee: Texaco Inc.
    Inventors: Kechia J. Chou, Kathleen M. Hellmuth
  • Membrane separation process
    Patent number: 5143620
    Abstract: Membrane separation process is improved by use, as a support membrane, of (i) a polyacrylonitrile membrane on which at least a portion of the surface --CN groups have been hydrolyzed --COOH groups or (ii) a membrane formed of polyacrylonitrile and polyacrylic acid.
    Type: Grant
    Filed: June 25, 1991
    Date of Patent: September 1, 1992
    Assignee: Texaco Inc.
    Inventors: Kechia J. Chou, Kathleen M. Hellmuth
  • Polymer containing a polyisobutylene-derived backbone
    Patent number: 4973732
    Abstract: Polymers, such as polysiobutylene or ethylene-propylene copolymers, are functionalized by reaction with an activated imine to yield novel polymers.
    Type: Grant
    Filed: February 9, 1987
    Date of Patent: November 27, 1990
    Assignee: Texaco Inc.
    Inventors: Phillip B. Valkovich, Kechia J. Chou
  • Method of functionalizing polymers
    Patent number: 4973733
    Abstract: Polymers, such as polyisobutylene or ethylene-propylene copolymers, are functionalized by reaction with an activated imine to yield novel polymers.
    Type: Grant
    Filed: February 9, 1987
    Date of Patent: November 27, 1990
    Assignee: Texaco Inc.
    Inventors: Phillip B. Valkovich, Kechia J. Chou
  • Polymers with amino-methyl-propene-2-yl groups contaiing electron-withdrawing groups
    Patent number: 4904741
    Abstract: Polymers, such as polyisobutylene or ethylene-propylene copolymers, are functionalized by reaction with an activated imine to yield novel polymers.
    Type: Grant
    Filed: February 9, 1987
    Date of Patent: February 27, 1990
    Assignee: Texaco Inc.
    Inventors: Phillip B. Valkovich, Kechia J. Chou
  • Polyoxyalkylene glycol conversion to monocarboxylic acid
    Patent number: 4826768
    Abstract: A method for converting a polyoxyalkylene glycol to the corresponding monoacid which comprises forming a mixture of a polyoxyalkylene glycol, a Gluconobacter species and a nutrient medium is provided.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: May 2, 1989
    Assignee: Texaco Inc.
    Inventor: Kechia J. Chou
  • Lubricating oil containing a polymer having a functionalized backbone which contains an electron withdrawing group
    Patent number: 4659491
    Abstract: Polymers, such as polyisobutylene or ethylene-propylene copolymers, are functionalized by reaction with an activated imine to yield novel polymers.
    Type: Grant
    Filed: December 24, 1984
    Date of Patent: April 21, 1987
    Assignee: Texaco Inc.
    Inventors: Phillip B. Valkovich, Kechia J. Chou
  • Amine-polymer dispersants in lubricating oils and a method of improving the dispersancy of a lubricating oil
    Patent number: 4510063
    Abstract: Polymers containing amine functionality, prepared by hydrolyzing polymers bearing carbamate functionality, may be converted to dispersants useful in lubricating oils.
    Type: Grant
    Filed: July 5, 1983
    Date of Patent: April 9, 1985
    Assignee: Texaco Inc.
    Inventors: Kechia J. Chou, Phillip B. Valkovich
  • Hydrocarbyl dihydrouracil, its method of preparation and lubricating oil composition containing same
    Patent number: 4329239
    Abstract: A hydrocarbyl-substituted dihydrouracil represented by the formula: ##STR1## in which R is a hydrocarbyl radical having an average molecular weight ranging from about 150 to 2000 and R' is hydrogen, a hydrocarbyl radical having from 1 to 20 carbon atoms, or an R"--(X--R'").sub.y -- radical in which R" is an alkyl radical having from 1 to 12 carbon atoms, X is oxygen or an --NH-- radical, R'" is a divalent hydrocarbon radical having from 1 to 3 carbon atoms and y is an integer from 1 to 3, a method for preparing said hydrocarbyl-substituted dihydrouracil, and a lubricating oil composition containing same is provided.
    Type: Grant
    Filed: May 12, 1980
    Date of Patent: May 11, 1982
    Assignee: Texaco Inc.
    Inventor: Kechia J. Chou
  • Hydrocarbyl carbamidopropanamide, its method of preparation and lubricating oil composition containing same
    Patent number: 4303535
    Abstract: A hydrocarbyl-substituted carbamidopropanamide represented by the formula: ##STR1## in which R is a hydrocarbyl radical having an average molecular weight ranging from about 150 to 2000 and R' is hydrogen, a hydrocarbyl radical having from 1 to 20 carbon atoms or an R"(X-R'").sub.y -- radical in which R" is an alkyl radical having from 1 to 12 carbon atoms, X is oxygen or an --NH-- radical having from 1 to 3 carbon atoms and y is an integer from 1 to 3, a method for preparing said hydro-carbyl-substituted carbamidopropanamide, and a lubricating oil containing same is provided.
    Type: Grant
    Filed: May 12, 1980
    Date of Patent: December 1, 1981
    Assignee: Texaco Inc.
    Inventor: Kechia J. Chou
  • N-sulfonylated polyalkenylsuccinimide and lubricant composition
    Patent number: 4194982
    Abstract: An N-sulfonylated hydrocarbon-substituted succinimide represented by the formula: ##STR1## in which R and R' are hydrocarbon radicals and a lubricating oil composition for an internal combustion engine containing an N-sulfonylated hydrocarbon-substituted succinimide.
    Type: Grant
    Filed: July 3, 1978
    Date of Patent: March 25, 1980
    Assignee: Texaco Inc.
    Inventor: Kechia J. Chou
  • Lubricating oil composition
    Patent number: 4104182
    Abstract: A lubricating oil composition comprising a hydrocarbyl oil of lubricating viscosity, a metal-containing additive characterized by promoting the formation of hard deposits in an internal combustion engine, and a hydrocarbon-substituted succinimide represented by the formula: ##STR1## in which R is an aliphatic hydrocarbon radical having from about 1 to 50 carbon atoms and R' is a hydrocarbon radical having from 3 to 20 carbon atoms, and a method for lubricating an internal combustion engine.
    Type: Grant
    Filed: May 16, 1977
    Date of Patent: August 1, 1978
    Assignee: Texaco Inc.
    Inventors: Kechia J. Chou, Walter W. Hellmuth