Patents by Inventor Donald L. De Vries

Donald L. De Vries 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).

  • Solid particles-containing lubricating oil composition and method for using same
    Patent number: 4094799
    Abstract: An improved lubricating oil composition comprising a major amount of oil of lubricating viscosity; a minor amount by weight of solid particles effective to improve the lubricating properties of the composition; and a minor amount by weight of at least one of certain co-polymers derived from the polymerization of (1) an N-vinyl-pyrrolidone, and (2) an oil-soluble acrylic ester.An improved method for lubricating an internal combustion engine is also disclosed.
    Type: Grant
    Filed: December 20, 1976
    Date of Patent: June 13, 1978
    Assignee: Atlantic Richfield Company
    Inventors: Donald L. De Vries, James M. DeJovine