Patents by Inventor Isabel P. MacDonald

Isabel P. MacDonald 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: 6423670
    Abstract: A heavy duty diesel engine lubricating oil composition having no more than 0.10 wt. % phosphorus comprises an ashless dispersant, a neutral calcium phenate, an overbased calcium or magnesium sulfonate, a metal dihydrocarbyldithiophosphate, and a phenolic or aminic antioxidant.
    Type: Grant
    Filed: March 14, 2001
    Date of Patent: July 23, 2002
    Assignee: Infineum International Ltd.
    Inventors: Christopher J. Locke, Isabel P. MacDonald
  • Lubricating oil compositions
    Publication number: 20010036906
    Abstract: A heavy duty diesel engine lubricating oil composition having no more than 0.10 wt. % phosphorus comprises an ashless dispersant, a neutral calcium phenate, an overbased calcium or magnesium sulfonate, a metal dihydrocarbyldithiophosphate, and a phenolic or aminic antioxidant.
    Type: Application
    Filed: March 14, 2001
    Publication date: November 1, 2001
    Inventors: Christopher J. Locke, Isabel P. MacDonald
  • 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
  • Concentrates with high molecular weight dispersants and their preparation
    Patent number: 6140279
    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 other concentrate additive provided that the additive is first mixed with the detergent or the dispersant.
    Type: Grant
    Filed: April 9, 1999
    Date of Patent: October 31, 2000
    Assignee: Exxon Chemical Patents Inc
    Inventors: Jacob Emert, Isabel P. MacDonald