Patents by Inventor Kenji Niijima

Kenji Niijima 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).

  • Friction material
    Patent number: 4861809
    Abstract: A friction material containing from about 0.5-29 wt % of carbonaceous fibers with a bond nitrogen content of from about 14 to 21 wt %, an auxiliary material and a thermosetting resin. The material has good wear and temperature resistance characteristics and can be used in power transmissions and brakes.
    Type: Grant
    Filed: May 27, 1988
    Date of Patent: August 29, 1989
    Assignee: Toho Rayon Co., Ltd.
    Inventors: Hiroyasu Ogawa, Kenji Shimazaki, Kenji Niijima
  • Carbon fiber reinforced carbon friction element and method of making
    Patent number: 4339021
    Abstract: A friction material comprising a carbon fiber reinforced carbon with an oxidation temperature of at least 800.degree. C. and a crystallinity index of matrix carbon of from 2.3 to 5.0, a process for the production of the same, and a friction element comprising the same.
    Type: Grant
    Filed: July 18, 1980
    Date of Patent: July 13, 1982
    Assignee: Toho Beslon Co., Ltd.
    Inventors: Hiroyuki Kosuda, Kenji Niijima
  • Tobacco smoke filter
    Patent number: 4195649
    Abstract: A tobacco smoke filter capable of selectively removing irritating materials and unpleasant bitter components from tobacco smoke and containing as a filter element nitrogen-containing activated carbon fibers produced by oxidizing acrylonitrile polymer fibers and then activating the oxidized fibers.
    Type: Grant
    Filed: January 13, 1978
    Date of Patent: April 1, 1980
    Assignees: Toho Beslon Co., Ltd., The Japan Tobacco and Salt Public Corp.
    Inventors: Katsuichi Noguchi, Kazuo Maeda, Yuriko Anzai, Minoru Hirai, Kazuo Izumi, Kenji Niijima