Patents by Inventor Robert Lee Coffman

Robert Lee Coffman 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).

  • Silicone hydraulic fluids
    Patent number: 3974080
    Abstract: Hydraulic fluids having excellent water tolerance at -40.degree.C. are provided by a mixture of an alkoxy-siloxane and a glycol ether phosphoric acid ester.
    Type: Grant
    Filed: October 29, 1975
    Date of Patent: August 10, 1976
    Assignee: Union Carbide Corporation
    Inventors: Robert Lee Coffman, Richard Welty Shiffler