Patents by Inventor Keiko Katayama

Keiko Katayama 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).

  • Rubber compositions suitable for tires comprising amorphous styrene-butadiene copolymer
    Patent number: 4485205
    Abstract: Rubber compositions for tires having low rolling resistance and excellent running stability consist mainly of a rubber blend consisting of 10-90% by weight of a high vinyl amorphous butadiene-styrene copolymeric rubber obtained by copolymerizing styrene with 1,3-butadiene and containing 3-30% by weight of bonded styrene and not less than 60% by weight of 1,2-bond in butadiene unit, and 90-10% by weight of a dienic rubber having a glass transition temperature of lower than -60.degree. C.
    Type: Grant
    Filed: November 29, 1982
    Date of Patent: November 27, 1984
    Inventors: Tatsuo Fujimaki, Tomoharu Yamada, Keiko Katayama, Seisuke Tomita