Patents by Inventor Robert Charles Watkins

Robert Charles Watkins 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: 3966621
    Abstract: The preparation of overbased Group II metal sulphurized phenates by reacting the metal base, a sulphurized phenol or phenol sulphur mixture a diol and an alcohol in oil over a controlled temperature cycle, introducing carbon dioxide to the mixture when the temperature is less than 140.degree.C and the water present in the mixture has been reduced to below 0.3% by weight of the mixture.
    Type: Grant
    Filed: May 12, 1975
    Date of Patent: June 29, 1976
    Assignee: Exxon Research and Engineering Company
    Inventors: Robert Charles Watkins, Derek Alfred Kinghan, Robert Walter Humphrey