Patents by Inventor Kouichi Ikai

Kouichi Ikai 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).

  • Rubber composition comprising carbon black surface treated with silica
    Patent number: 5883179
    Abstract: A rubber composition containing at least one rubber component containing a diene rubber and a rubber reinforcing carbon black having silica deposited on the surface thereof.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: March 16, 1999
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Masayuki Kawazoe, Tetsuji Kawazura, Kouichi Ikai, Yoshiaki Hashimura, Fumito Yatsuyanagi, Kazunori Ishikawa
  • Surface-treated carbon black and rubber composition containing same
    Patent number: 5679728
    Abstract: A rubber composition containing a cross-linkable rubber component and a carbon black having silica adhered to the surface thereof and a silica surface-treated carbon black suitable for use in tire tread where the surface-treated carbon black has a nitrogen specific surface area (N.sub.2 SA) of 20 to 300 m.sup.2 /g, a ratio IA.sub.o /IA.sub.f of the adsorption amount of iodine (IA.sub.o) and the adsorption amount of iodine after treatment by hydrogen fluoride (IA.sub.f) of at least 0.30 but less than 1.0, and a ratio IA.sub.e /IA.sub.ef of the adsorption amount of iodine after extraction from a rubber compound (IA.sub.e) and the value of the same after treatment by hydrogen fluoride (IA.sub.ef) of at least 0.30 but less than 1.0.
    Type: Grant
    Filed: November 2, 1995
    Date of Patent: October 21, 1997
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Tetsuji Kawazura, Hiroyuki Kaido, Kouichi Ikai, Fumito Yatsuyanagi, Masayuki Kawazoe