Patents by Inventor Fumito Yatsuyanagi

Fumito Yatsuyanagi 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).

  • Process for production of surface-treated carbon black for rubber reinforcement
    Patent number: 6019832
    Abstract: A process for producing surface-treated carbon black for rubber reinforcement comprising: a surface treatment reaction step of dispersing carbon black for rubber reinforcement in water, followed by reacting a metal silicate and an acid in the dispersion to thereby deposit amorphous silica on the surface of the carbon black; and a subsequent aging step of bringing the pH of the dispersion to not more than 7.
    Type: Grant
    Filed: June 18, 1997
    Date of Patent: February 1, 2000
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Tetsuji Kawazura, Masayuki Kawazoe, Fumito Yatsuyanagi, Shuji Takahashi
  • Rubber composition containing carbon black
    Patent number: 5962575
    Abstract: A carbon-containing rubber composition containing a rubber composition containing carbon black, obtained by coagulating, dehydrating, and drying a rubber latex mixture containing a latex of at least one starting rubber A having an average glass transition temperature TgA of -120.degree. C. to -15.degree. C., carbon black, and part of a softening agent, mixed in an internal mixer with a starting rubber B and part of the softening agent, with a ratio F.sub.A /F.sub.B of the concentration F.sub.A of carbon black in the copolymer in the rubber latex mixture with the concentration F.sub.B of carbon black in the copolymer after kneading by the hermetic mixture being 1.2 to 3.0 and a rubber composition containing carbon black comprising a starting rubber A' comprising a polymer having functional groups represented by formula (I)--C.dbd.
    Type: Grant
    Filed: December 3, 1997
    Date of Patent: October 5, 1999
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Fumito Yatsuyanagi, Hiroyuki Kaido, Tetsuji Kawazura
  • 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