Patents by Inventor Andrew J. D. Ritchie

Andrew J. D. Ritchie 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).

  • Lubricating oil compositions
    Patent number: 11034912
    Abstract: A method of preventing or reducing the occurrence of Low Speed Pre-Ignition (LSPI) in a direct-injected, boosted, spark-ignited internal combustion engine that, in operation, generates a break mean effective pressure level of greater than about 15 bar, at an engine speed of from about 1500 to about 2500 rotations per minute (rpm), in which the crankcase of the engine is lubricated with a lubricating oil composition containing at least about 0.2 mass % of magnesium sulfated ash.
    Type: Grant
    Filed: April 29, 2014
    Date of Patent: June 15, 2021
    Inventors: Andrew J. D. Ritchie, Doyle Boese, Jose A. Gutierrez
  • LUBRICATING OIL COMPOSITIONS
    Publication number: 20150307802
    Abstract: A method of preventing or reducing the occurrence of Low Speed Pre-Ignition (LSPI) in a direct-injected, boosted, spark-ignited internal combustion engine that, in operation, generates a break mean effective pressure level of greater than about 15 bar, at an engine speed of from about 1500 to about 2500 rotations per minute (rpm), in which the crankcase of the engine is lubricated with a lubricating oil composition containing at least about 0.2 mass % of magnesium sulfated ash.
    Type: Application
    Filed: April 29, 2014
    Publication date: October 29, 2015
    Applicant: Infineum International Limited
    Inventors: Andrew J. D. Ritchie, Doyle Boese, Jose A. Gutierrez
  • Lubricating oil compositions
    Patent number: 7018958
    Abstract: A lubricating oil composition having a total base number of at least about 8, comprising a major amount of oil of lubricating viscosity; an amount of one or more dihydrocarbyl dithiophosphate metal salt introducing into the lubricating oil composition no more than 0.06 wt. % of phosphorus; at least 1.2 wt. % of hindered phenol antioxidant; and boron, and/or a boron-containing compound or compounds in an amount providing the lubricating oil composition with at least 200 ppm by weight of boron, all weight percentages being based on the total weight of the lubricating oil composition.
    Type: Grant
    Filed: October 22, 2002
    Date of Patent: March 28, 2006
    Assignee: Infineum International Limited
    Inventors: Stephen Arrowsmith, Nancy Z. Diggs, Andrew J. D. Ritchie, Jorge O. Pain
  • Lubricating oil compositions
    Patent number: 6869919
    Abstract: Soot induced kinematic viscosity increase of lubricating oil compositions for diesel engines equipped with EGR systems can be ameliorated by selection of viscosity modifier, lubricating oil flow improvers, detergents and/or dispersants.
    Type: Grant
    Filed: September 10, 2002
    Date of Patent: March 22, 2005
    Assignee: Infineum International Ltd.
    Inventors: Andrew J. D. Ritchie, Jai G. Bansal, Jacob Emert, Glen P. Fetterman, Antonio Gutierrez, Matthew D. Irving, Christopher J. Locke, Michael T. Minotti
  • Lubricating oil compositions
    Publication number: 20040077506
    Abstract: A lubricating oil composition having a total base number of at least about 8, comprising a major amount of oil of lubricating viscosity; an amount of one or more dihydrocarbyl dithiophosphate metal salt introducing into the lubricating oil composition no more than 0.06 wt. % of phosphorus; at least 1.2 wt. % of hindered phenol antioxidant; and boron, and/or a boron-containing compound or compounds in an amount providing the lubricating oil composition with at least 200 ppm by weight of boron, all weight percentages being based on the total weight of the lubricating oil composition.
    Type: Application
    Filed: October 22, 2002
    Publication date: April 22, 2004
    Inventors: Stephen Arrowsmith, Nancy Z. Diggs, Andrew J. D. Ritchie, Jorge O. Pain
  • EGR equipped diesel engines and lubricating oil compositions
    Patent number: 6715473
    Abstract: Soot induced kinematic viscosity increase of lubricating oil compositions for heavy duty diesel engines equipped with EGR systems operating in a condensing mode can be ameliorated by selection of viscosity modifier, lubricating oil flow improvers, detergents and dispersants.
    Type: Grant
    Filed: July 30, 2002
    Date of Patent: April 6, 2004
    Assignee: Infineum International Ltd.
    Inventors: Andrew J. D. Ritchie, Jai G. Bansal, Jacob Emert, Glen P. Fetterman, Antonio Gutierrez, Matthew D. Irving, Christopher J. Locke, Michael T. Minotti
  • Lubricating oil compositions
    Publication number: 20040048753
    Abstract: Soot induced kinematic viscosity increase of lubricating oil compositions for diesel engines equipped with EGR systems can be ameliorated by selection of viscosity modifier, lubricating oil flow improvers, detergents and/or dispersants.
    Type: Application
    Filed: September 10, 2002
    Publication date: March 11, 2004
    Inventors: Andrew J.D. Ritchie, Jai G. Bansal, Jacob Emert, Glen P. Fetterman, Antonio Gutierrez, Matthew D. Irving, Christopher J. Locke, Michael T. Minotti
  • EGR EQUIPPED DIESEL ENGINES AND LUBRICATING OIL COMPOSITIONS
    Publication number: 20040025853
    Abstract: Soot induced kinematic viscosity increase of lubricating oil compositions for heavy duty diesel engines equipped with EGR systems operating in a condensing mode can be ameliorated by selection of viscosity modifier, lubricating oil flow improvers, detergents and dispersants.
    Type: Application
    Filed: July 30, 2002
    Publication date: February 12, 2004
    Inventors: Andrew J. D. Ritchie, Jai G. Bansal, Jacob Emert, Glen P. Fetterman, Antonio Gutierrez, Matthew D. Irving, Christopher J. Locke, Michael T. Minotti
  • High molecular weight dispersant compositions and their preparation
    Patent number: 6310010
    Abstract: Concentrates for lubricating oil compositions are prepared by mixing at elevated temperature: (i) at least one high molecular weight ashless dispersant; (ii) at least one oil-soluble overbased metal detergent; and (iii) at least one surface-active agent comprising a low molecular weight hydroxyl or amine group.
    Type: Grant
    Filed: April 9, 1999
    Date of Patent: October 30, 2001
    Assignee: Exxon Chemicals Patents INC
    Inventors: Gary Higton, Jacob Emert, Robert A. Wilkinson, Isabel P. MacDonald, Karl J. Van Driesen, Salvatore Rea, James P. Stokes, Andrew J. D. Ritchie
  • Lubricating compositions with improved antioxidancy comprising added copper, a molybdenum containing compound, aromatic amine and ZDDP
    Patent number: 5994277
    Abstract: Crankcase lubricant compositions for use in automobile or truck engines comprise a major amount of a lubricating oil, added copper present in oil-soluble form, at least 2 ppm of molybdenum present in oil-soluble form, and a total of from 0.05 to 2 mass % of one or more oil-soluble aromatic amines. The specified additives provide a highly effective antioxidant system.
    Type: Grant
    Filed: April 3, 1996
    Date of Patent: November 30, 1999
    Assignee: Exxon Chemical Patents, Inc.
    Inventors: Andrew J. D. Ritchie, Harold Shaub, Ian P. Field
  • Lubricating oil compositions and additives for use therein
    Patent number: 5232614
    Abstract: Substituted para-phenylene diamines have been found to be effective antioxidants capable of protecting crankcase lubricating oils from thickening and sludge formation after prolonged exposure to oxygen at elevated temperature.
    Type: Grant
    Filed: October 24, 1991
    Date of Patent: August 3, 1993
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Terence Colclough, Andrew J. D. Ritchie