Patents by Inventor Robert L. Shell

Robert L. Shell 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).

  • Cut growth resistant rubbers
    Patent number: 4197383
    Abstract: A method of providing a cured low unsaturated elastomer polymer of improved crack growth resistance under high flex conditions. Specifically, oxypropylene rubbers are compounded with small amounts of hexamethylene tetramine and polyhydroxyl aromatic compounds having less than 500 molecular weight.
    Type: Grant
    Filed: June 19, 1975
    Date of Patent: April 8, 1980
    Assignee: The Goodyear Tire & Rubber Company
    Inventor: Robert L. Shell
  • Propylene oxide copolymer composition
    Patent number: 3985707
    Abstract: A composition comprising a rubbery copolymer of propylene oxide in admixture with a heat age resisting mixture of a nickel dialkyl dithiocarbamate and an imidazole where the ratio of the carbamate units to imidazole units is in the range of from about 16:1 to about 1:40. The composition has particular utility for providing a rubbery copolymer of propylene oxide having improved resistance to heat aging in a temperature range of about 100.degree.C. to about 170.degree.C.
    Type: Grant
    Filed: June 23, 1975
    Date of Patent: October 12, 1976
    Assignee: The Goodyear Tire & Rubber Company
    Inventor: Robert L. Shell