Patents by Inventor Robert A. Wilkinson

Robert A. Wilkinson 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).

  • Oleaginous concentrates
    Patent number: 6605571
    Abstract: Concentrates for lubricating oil compositions are prepared by blending at elevated temperature: (A) at least one high molecular weight ashless dispersant; and (B) at least one oil-soluble metal detergent; in the presence of (C) at least one metal salt of a dihydrocarbylphosphorodithoic acid wherein the metal of the metal salt is an alkali metal, an alkaline earth metal, or zinc, aluminium, lead, tin, molybdenum, manganese, nickel or copper.
    Type: Grant
    Filed: April 2, 1999
    Date of Patent: August 12, 2003
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Gary Higton, Roger Glyde, Robert A. Wilkinson
  • 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