Patents by Inventor Shigelu Yagishita

Shigelu Yagishita 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).

  • Vulcanizable elastomer composition comprising epoxy group-containing elastomer, organic compound having at least two -C(X)-NH-C(Y)-bonds (X=O or S, Y=O or S), quaternary ammonium or phosphonium salt, and optionally a urea or thiourea compound
    Patent number: 5334666
    Abstract: A vulcanizable elastomer composition comprising an epoxy group-containing elastomer, and blended therewith(1) an organic compound having at least two bonds of the formula --C(X)'NH--C(Y)--, wherein X and Y are both oxygen or sulfur, or one of X and Y is oxygen and the other is sulfur, in the molecule,(2) a quaternary compound selected from quaternary ammonium salts and quaternary phosphonium salts, andoptionally, (3) a compound having one >N--C(Z)--N<bond wherein Z represents an oxygen or sulfur.
    Type: Grant
    Filed: April 23, 1993
    Date of Patent: August 2, 1994
    Assignee: Nippon Zeon Co., Ltd.
    Inventor: Shigelu Yagishita
  • Curable acrylate-type elastomer composition
    Patent number: 4931509
    Abstract: A curable elastomeric composition comprising an epoxy group-containing acrylate-type elastomer in combination with (1) a polycarboxylic acid or its anhydride, (2) a quaternary ammonium or phosphonium salt and (3) a urea.
    Type: Grant
    Filed: April 3, 1987
    Date of Patent: June 5, 1990
    Assignees: Nippon Zeon Co., Ltd., Toyoda Gosei Co., Ltd.
    Inventors: Shigelu Yagishita, Masatoshi Sugimoto, Tomoaki Okita
  • Vulcanizable epoxy group-containing elastomer composition
    Patent number: 4650834
    Abstract: A vulcanizable epoxy group-containing elastomer composition comprising an elastomer containing epoxy groups, a polycarboxylic acid having at least 2 carboxyl groups in the molecule, and either a quaternary ammonium salt or a quaternary phosphonium salt.
    Type: Grant
    Filed: July 2, 1985
    Date of Patent: March 17, 1987
    Assignees: Nippon Zeon Co., Ltd., Toyoda Gosei Co., Ltd.
    Inventors: Shigelu Yagishita, Kiyoshi Hosoya, Tadaoki Okumoto, Masatoshi Sugimoto
  • Rubber composition capable of giving vulcanizates having improved ozone cracking resistance and oil resistance
    Patent number: 4404329
    Abstract: A rubber composition comprising (1) a partially hydrogenated copolymer rubber composed of 10 to 50% by weight of an acrylonitrile unit, 25 to 88% by weight of a hydrogenated conjugated diene unit and 2 to 25% by weight of a conjugated diene unit, and (2) a sulfur vulcanizer system. The composition can give vulcanizates having improved ozone cracking resistance and oil resistance.
    Type: Grant
    Filed: June 10, 1980
    Date of Patent: September 13, 1983
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Akio Maeda, Kinro Hashimoto, Shigelu Yagishita, Masaaki Inagami, Hiroshi Fukushima