Patents by Inventor James L. Purvis

James L. Purvis 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).

  • Water resistant grease composition
    Patent number: 5110489
    Abstract: A grease composition having impoved water resistance is disclosed. More specifically, the addition of a copolymer of ethylene and at least one other alpha-olefin monomer and an ethylene copolymer having an amine functionality to a base grease comprising a lubricating oil and a water insoluble thickener results in a grease composition which has excellent water resistance. In a preferred embodiment, polyisoprene is added to obtain a further improvement in water resistance.
    Type: Grant
    Filed: June 27, 1989
    Date of Patent: May 5, 1992
    Assignee: Exxon Research and Engineering Company
    Inventors: James F. Stadler, David L. Kufen, James L. Purvis