Patents by Inventor Dennis J. Simpkin

Dennis J. Simpkin 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).

  • Preparation of sulfurized phenol additives intermediates and compositions
    Patent number: 6245724
    Abstract: A process is described wherein olefins or acetylenic compounds are reacted with sulfurised intermediates to produce nitrile seal compatible additives. Olefin or acetylinic compound reaction with sulfurised compounds e.g. sulfurised phenols results in low chlorine additives. Also disclosed is a process for the production of low chlorine intermediates.
    Type: Grant
    Filed: July 24, 1998
    Date of Patent: June 12, 2001
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Philip Skinner, Dennis J. Simpkin, David Robert Adams
  • Basic alkaline earth metal sulphonates
    Patent number: 4557872
    Abstract: Oil soluble basic magnesium sulphonates useful as lubricating oil additives are prepared by blowing carbon dioxide through a mixture of sulphonic acid or its sulphonate, magnesium oxide, a hydrocarbon solvent, water, a C.sub.3 to C.sub.6 ketone and a reaction promoter.
    Type: Grant
    Filed: October 11, 1983
    Date of Patent: December 10, 1985
    Assignee: Exxon Research & Engineering Co.
    Inventors: John F. Marsh, John A. Cleverley, Dennis J. Simpkin