Patents Assigned to Kabushiki Kaisha Togowa Gomu Seizosho
  • 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