Patents by Inventor Brian D. W. Powell

Brian D. W. Powell 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).

  • Pneumatic tires
    Patent number: 5115021
    Abstract: Pneumatic tires having an improved steering response have a tread portion which comprises a blend of a base elastomer and, as a steering response substance, a polymer of an unsaturated compound selected from methacrylic acid, acrylic acid and lower alkyl esters thereof. The steering response substance is preferably a graft copolymer of polyisoprene and methylmethacrylate. A preferred amount of the steering response substance is in the range from 5 to 60% by weight of the total of the base elastomer and the steering response substance.
    Type: Grant
    Filed: June 28, 1989
    Date of Patent: May 19, 1992
    Assignee: Sumitomo Rubber Industries Ltd.
    Inventors: Robert J. Blythe, Brian D. W. Powell