Patents by Inventor Kikuo Yonekura

Kikuo Yonekura 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).

  • Self-closing gas pipes and pipe joints
    Patent number: 4267853
    Abstract: A gas pipe including a tube of expansible material defining a passage for gas and capable of expansion, when heated, to close the passage upon carbonization. The tube is surrounded by a cylindrical noninflammable member.A joint for connecting gas pipes which includes a tube of expansible material contained in a metallic tubular member and defining a passage for gas. The tube is capable of expansion, when heated, to close the passage upon carbonization.A method of manufacturing thermally expansible rubber tube for the gas pipe and the gas pipe joint. About 2 to 30 parts by weight of oxidized, thermally expansible graphite powder is mixed with 100 parts by weight of raw rubber, and a predetermined quantity of a curing agent and a cure accelerator are added to the rubber and graphite mixture, followed by its formation into a tubular shape.
    Type: Grant
    Filed: February 13, 1978
    Date of Patent: May 19, 1981
    Assignees: Toho Gasu Kabushiki Daisha, Kabushiki Kaisha Togawa Gomu Seizosho
    Inventors: Yukio Yamaguchi, Kenji Ishihara, Kikuo Yonekura
  • Method of making thermally expansible rubber tubes for use in self-closing gas pipes and pipe joints
    Patent number: 4229341
    Abstract: A method of manufacturing a thermally expansible rubber tube for use in gas pipes and gas pipe joints. About 2 to 30 parts by weight of oxidized, thermally expansible graphite powder is mixed with 100 parts by weight of raw rubber, and a predetermined quantity of a curing agent and a cure accelerator are added to the rubber and graphite mixture, followed by its formation into a tubular shape.
    Type: Grant
    Filed: February 15, 1979
    Date of Patent: October 21, 1980
    Assignees: Toho Gasu Kabushiki Kaisha, Kabushiki Kaisha Togowa Gomu Seizosho
    Inventors: Yukio Yamaguchi, Kenji Ishihara, Kikuo Yonekura