Patents by Inventor Hironobu Shigematsu

Hironobu Shigematsu 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).

  • Cured ethylene..alpha.-olefin copolymer-based rubber composition
    Patent number: 5246990
    Abstract: A cured ethylene.multidot..alpha.-olefin copolymer-based rubber composition excellent in weathering resistance property is produced by curing with an organic peroxide an uncured rubber composition comprising 100 parts by weight of an ethylene .multidot..alpha.-olefin copolymer-based rubber, 1 to 10 parts by weight of a hindered amine-based weathering agent, 0.01 to 10 parts by weight of a phenol-based antioxidant, 0.01 to 10 parts by weight of a sulfur-based antioxidant, 0.01 to 10 parts by weight of a phosphite ester-based antioxidant, and 1 to 10 parts by weight of a benzotriazole-based ultraviolet absorber.
    Type: Grant
    Filed: November 15, 1991
    Date of Patent: September 21, 1993
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Masashi Aoshima, Hironobu Shigematsu, Takeru Wadaki
  • Waterproof rubber sheet
    Patent number: 5130182
    Abstract: A fusion bonded waterproof sheet having a first ethylene-.alpha.-olefin rubber layer which has a high crosslinking rate and is changed to a crosslinked layer and a second ethylene-.alpha.-olefin rubber layer which has a low crosslinking rate and is changed to a partially crosslinked layer, the crosslinking of both sheets being carried after compositing and integrating them, which sheet has good fusion bondability and good bond strength at high temperature.
    Type: Grant
    Filed: September 6, 1991
    Date of Patent: July 14, 1992
    Assignee: Sumitomo Chemical Co., Ltd.
    Inventors: Masashi Aoshima, Hironobu Shigematsu, Tatsuo Sassa