Patents by Inventor Motoi Itoh

Motoi Itoh 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).

  • Carbon fibers and process for preparing same
    Patent number: 5691055
    Abstract: Carbon fibers with a surface oxygen concentration (O/C ratio) of 0.20 or less as measured by X-ray photoelectron spectroscopy, a surface concentration of hydroxyl groups (C--OH/C ratio) of 0.5% or greater as measured by chemical modification X-ray photoelectron spectroscopy and a surface concentration of carboxylic groups (COOH/C ratio) of 2.0% or less as measured by chemical modification X-ray photoelectron spectroscopy, and an aliphatic compound applied as a sizing agent which has multiple epoxy groups or an aromatic compound which has multiple epoxy groups, the number of atoms between the epoxy groups and an aromatic ring being 6 or greater.
    Type: Grant
    Filed: June 13, 1996
    Date of Patent: November 25, 1997
    Assignee: Toray Industries, Inc.
    Inventors: Masanobu Kobayashi, Motoi Itoh, Yoji Matsuhisa, Kazuharu Shimizu
  • Method for preparing carbon fibers
    Patent number: 5589055
    Abstract: A process for preparing carbon fibers including electrolyzing a carbon fiber in an alkaline aqueous solution, or electrolyzing a carbon fiber in an acidic aqueous solution followed by washing with an alkaline aqueous solution, and then applying a sizing agent of an aliphatic compound with multiple epoxy groups or an aromatic compound with multiple epoxy groups in which the number of atoms between the epoxy groups and an aromatic ring is 6 or greater. Alternatively, the carbon fibers are prepared by electrolyzing a carbon fiber in an aqueous solution of an ammonium salt and then applying a sizing agent of an aliphatic compound with multiple epoxy groups or an aromatic compound with multiple epoxy groups in which the number of atoms between the epoxy groups and an aromatic ring is 6 or greater.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: December 31, 1996
    Assignee: Toray Industries, Inc.
    Inventors: Masanobu Kobayashi, Motoi Itoh, Yoji Matsuhisa, Kazuharu Shimizu
  • Carbon fibers and process for preparing same
    Patent number: 5587240
    Abstract: Carbon fibers with a surface oxygen concentration (O/C ratio) of 0.20 or less as measured by X-ray photoelectron spectroscopy, a surface concentration of hydroxyl groups (C-OH/C ratio) of 0.5% or greater as measured by chemical modification X-ray photoelectron spectroscopy and a surface concentration of carboxylic groups (COOH/C ratio) of 2.0% or less as measured by chemical modification X-ray photoelectron spectroscopy, and an aliphatic compound applied as a sizing agent which has multiple epoxy groups or an aromatic compound which has multiple epoxy groups, the number of atoms between the epoxy groups and an aromatic ring being 6 or greater.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: December 24, 1996
    Assignee: Toray Industries, Inc.
    Inventors: Masanobu Kobayashi, Motoi Itoh, Yoji Matsuhisa, Kazuharu Shimizu
  • Carbon fibers and process for preparing same
    Patent number: 5462799
    Abstract: Carbon fibers with a surface oxygen concentration (O/C ratio) of 0.20 or less as measured by X-ray photoelectron spectroscopy, a surface concentration of hydroxyl groups (C--OH/C ratio) of 0.5% or greater as measured by chemical modification X-ray photoelectron spectroscopy and a surface concentration of carboxylic groups (COOH/C ratio) of 2.0% or less as measured by chemical modification X-ray photoelectron spectroscopy, and comprising applied as a sizing agent an aliphatic compound which has multiple epoxy groups or an aromatic compound which has multiple epoxy groups, the number of atoms between the epoxy groups and an aromatic ring being 6 or greater.
    Type: Grant
    Filed: August 22, 1994
    Date of Patent: October 31, 1995
    Assignee: Toray Industries, Inc.
    Inventors: Masanobu Kobayashi, Motoi Itoh, Yoji Matsuhisa, Kazuharu Shimizu
  • Sizing agent for carbon fiber and carbon fiber treated with said sizing agent
    Patent number: 5298576
    Abstract: A sizing agent for carbon fibers which comprises, as the indispensable ingredients, an epoxy resin having a viscosity of more than 1,000 P but up to 20,000 P at 50 .degree. C. and a urethane compound prepared from a polyol having an oxyalkylene unit with a polyisocyanate.
    Type: Grant
    Filed: February 24, 1992
    Date of Patent: March 29, 1994
    Assignees: Toray Industries, Inc., Sanyo Chemical Industries, Ltd.
    Inventors: Atsushi Sumida, Toyokazu Minakuchi, Motoi Itoh, Itsuki Taniguchi, Hiroshi Hasegawa, Manabu Saito