Patents by Inventor Yoshiro Yagi

Yoshiro Yagi 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).

  • Patent number: 5232987
    Abstract: A rubber composition having an excellent wear resistance while holding proper hardness, modulus and the like as a vulcanizate comprises a blend of (A) styrene-diene copolymer rubber having specified content of bound styrene, glass transition temperature range and Mooney viscosity and (B) low molecular weight polymer having particular weight average molecular weight, wherein the blending ratio of the copolymer rubber (A) to the polymer (B) is 100 parts by weight to 10-120 parts by weight.
    Type: Grant
    Filed: September 5, 1991
    Date of Patent: August 3, 1993
    Assignees: Japan Synthetic Rubber Co., Ltd., Bridgestone Corporation
    Inventors: Mitsuhiko Sakakibara, Fumio Tsutsumi, Makoto Kondo, Yoshiro Yagi
  • Patent number: 5034465
    Abstract: A rubber composition useful for high performance tires comprises 10-200 parts by weight of a particular low molecular weight diene series hydrogenated polymer based on 100 parts by weight of a particular high molecular weight diene series hydrogenated polymer.
    Type: Grant
    Filed: November 29, 1989
    Date of Patent: July 23, 1991
    Assignees: Bridgestone Corporation, Japan Synthetic Rubber
    Inventors: Yoshiro Yagi, Iwakazu Hattori