Patents by Inventor Barry J. Howlett

Barry J. Howlett 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).

  • Haze resistant dispersant-detergent compositions
    Patent number: 5451333
    Abstract: According to the present invention, oleaginous compositions having improved stability are provided, wherein high molecular weight ashless dispersants and metal detergents are pre-blended at a temperature of at least 100.degree. C. for a period of from 1 to 10 hours, cooled to at least 85.degree. C. and admixed with additional additives, including oil soluble copper antioxidants and zinc dialkyl dithiophosphate antiwear agents.
    Type: Grant
    Filed: March 25, 1994
    Date of Patent: September 19, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Malcolm Waddoups, Barry J. Howlett
  • Process for preparing stable oleaginous compositions
    Patent number: 5312554
    Abstract: According to the present invention, oleaginous compositions having improved stability are provided, wherein high molecular weight ashless dispersants and metal detergents are preblended at a temperature of at least 100.degree. C. for a period of from 1 to 10 hours, cooled to at least 85.degree. C. and admixed with additional additives, including oil soluble copper antioxidants and zinc dialkyl dithiophosphate antiwear agents.
    Type: Grant
    Filed: July 6, 1989
    Date of Patent: May 17, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Malcolm Waddoups, Barry J. Howlett
  • Process for preparing stable oleaginous compositions
    Patent number: 4938880
    Abstract: According to the present invention, oleaginous compositions having improved stability are provided, wherein high molecular weight ashless dispersants and metal detergents are pre-blended at a temperature of at least 100.degree. C. for a period of from 1 to 10 hours, cooled to at least 85.degree. C. and admixed with additional additives, including oil soluble copper antioxidants and zinc dialkyl dithiophosphate antiwear agents.
    Type: Grant
    Filed: May 26, 1987
    Date of Patent: July 3, 1990
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Malcolm Waddoups, Barry J. Howlett
  • Lubricating oil composition containing a dispersing-varnish inhibiting combination of polyol ester compound and a borated acyl nitrogen compound
    Patent number: 4173540
    Abstract: The combination of an oil-soluble polyol ester reaction product having a number average molecular weight (M.sub.n) of from about 1,300 to 8,000, e.g., the reaction product of polybutenyl succinic anhydride with pentaerythritol which reaction product can be borated, if desired, and an oil-soluble acylated nitrogen compound having a (M.sub.n) of from about 1,300 to 8,000, e.g. polybutenyl succinic anhydride reacted with an alkylene polyamine such as tetraethylene pentamine, which nitrogen compound can be borated, if desired, are surprisingly useful as combined additives for lubricating oils to increase the dispersancy and varnish inhibition properties of said oil when one part per weight of said polyol ester reaction product is combined with from 0.2 to 4, preferably 1 to 3, parts by weight of said acylated nitrogen compound.
    Type: Grant
    Filed: October 3, 1977
    Date of Patent: November 6, 1979
    Assignee: Exxon Research & Engineering Co.
    Inventors: Thor F. Lonstrup, Darrell W. Brownawell, Barry J. Howlett