Patents by Inventor Kazuto Yamakawa

Kazuto Yamakawa 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 tire with air permeation preventive layer
    Patent number: 5938869
    Abstract: A pneumatic tire has an air permeation preventive layer comprised of a film or sheet composed of a polymer composition containing a thermoplastic resin or a blend of a thermoplastic resin and an elastomer with an air permeation coefficient of not more than 25.times.10.sup.-12 cc.multidot.cm/cm.sup.2 .multidot.sec.multidot.cmHg and a Young's modulus of 1 to 500 MPa and wherein the film or sheet is arranged so that at least one turn of the film or sheet in the tire circumferential direction is free from a join.
    Type: Grant
    Filed: February 11, 1997
    Date of Patent: August 17, 1999
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Hiroyuki Kaido, Kazuto Yamakawa, Jiro Watanabe
  • Pneumatic tire with air permeation preventive layer
    Patent number: 5851323
    Abstract: A pneumatic tire has an air permeation preventive layer comprising a film composed of a polymer composition containing a thermoplastic resin or a blend of a thermoplastic resin and an elastomer having an air permeation coefficient of not more than 25.times.10.sup.-12 cc.multidot.cm/cm.sup.2 .multidot.sec.multidot.
    Type: Grant
    Filed: February 19, 1997
    Date of Patent: December 22, 1998
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Hiroyuki Kaido, Kazuto Yamakawa, Jiro Watanabe, Zenichiro Shida, Yoshiaki Hashimura