Patents by Inventor Dennis John Simpkin

Dennis John 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: 5827806
    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: January 30, 1997
    Date of Patent: October 27, 1998
    Assignee: Exxon Chemical Patents, Inc.
    Inventors: Philip Skinner, Dennis John Simpkin, David Robert Adams