Patents by Inventor Tohru Kida

Tohru Kida 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).

  • Patent number: 5256243
    Abstract: A process for producing a titanium carbide whisker, comprising the steps of: mixing 100 parts by weight of a titanium source comprising titanium dioxide and/or an alkali metal titanate with 50 to 200 parts by weight of a carbon source and 1 to 30 parts by weight of a transition metal chloride; and heating the resultant mixture at 1300.degree. to 1700.degree. C. in an inert gas atmosphere.
    Type: Grant
    Filed: November 12, 1991
    Date of Patent: October 26, 1993
    Assignee: Tokai Carbon Co., Ltd.
    Inventor: Tohru Kida
  • Patent number: 4975302
    Abstract: Disclosed are surface-coated SiC whiskers, processes for preparing the same, a ceramic reinforced with the same, and a process for preparing said reinforced ceramic. The surface-coated SiC whiskers are SiC whiskers (I) having a surface coated with a thin carbonaceous layer having a thickness of 7 to 100 .ANG., or SiC whiskers (II) having a surface coated with an Si.sub.3 N.sub.4 layer. The SiC whiskers (I) can be prepared by dispersing SiC whiskers in a homogeneous solution of a thermosetting resin in an organic solvent, separating the whiskers by filtration and drying it, curing the thermosetting resin, and firing the cured thermosetting resin in a non-oxidizing atmosphere at 800.degree. to 1,600.degree. C. The SiC whiskers (II) can be prepared by the dispersing SiC whiskers in a solvent of an organosilicon polymer in an organic solvent, separating the whiskers by filtration and drying it, heating the whiskers coated with the organosilicon polymer in a nitriding atmosphere at 1,200.degree. to 1,600.degree.
    Type: Grant
    Filed: February 12, 1990
    Date of Patent: December 4, 1990
    Assignee: Tokai Carbon
    Inventors: Kanji Sugihara, Motohiro Yamamoto, Tohru Kida, Minoru Fukazawa
  • Patent number: 4929472
    Abstract: Disclosed are surface-coated SiC whiskers, proceses for preparing the same, a ceramic reinforced with the same, and a process for preparing said reinforced ceramic. The surface-coated SiC whiskers are SiC whiskers (I) having a surface coated with a thin carbonaceous layer having a thickness of 7 to 100 .ANG., or SiC whiskers (II) having a surface coated with an Si.sub.3 N.sub.4 layer. The SiC whiskers (I) can be prepared by dispersing SiC whiskers in a homogeneous solution of a thermosetting resin in an organic solvent, separating the whiskers by filtration and drying it, curing the thermosetting resin, and firing the cured thermosetting resin in a non-oxidizing atmoshpere at 800.degree. to 1,600.degree. C. The SiC whiskers (II) can be prepared by dispersing SiC whiskers in a solution of an organosilicon polymer in an organic solvent, separating the whiskers by filtration and drying it, heating the whiskers coated with the organosilicon polymer in a nitriding atmoshpere at 1,200.degree. to 1,600.degree. C.
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: May 29, 1990
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Kanji Sugihara, Motohiro Yamamoto, Tohru Kida, Minoru Fukazawa
  • Patent number: 4690811
    Abstract: The present invention provides a process for preparing silicon carbide whiskers. According to the process, carbon black having the following properties (a) to (c) is blended, as a carbonaceous material, with a silicon source material, and the resulting mixture is heated in a non-oxidizing atmosphere at 1,300.degree. to 1,800.degree. C.(a) Nitrogen adsorption specific surface area: 150 to 500 m.sup.2 /g(b) Dibutyl phthalate absorption: 120 to 200 ml/100 g.(c) Tint strength (%): equal to or below a value calculated according to the following formula:0.3496.times.(nitrogen adsorption specific surface area)-0.2143.times.(dibutyl phthalate absorption)+101.
    Type: Grant
    Filed: November 18, 1985
    Date of Patent: September 1, 1987
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Tohru Kida, Motohiro Yamamoto