Patents by Inventor Eiji Maruden

Eiji Maruden 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 producing a coil-shaped carbon fiber bundle
    Patent number: 5277850
    Abstract: The present invention relates to a carbon fiber bundle includes a regular coil-shaped fiber bundle and having excellent stretch characteristic. A process for producing a coil-shaped carbon fiber bundle according to the present invention includes the steps of compositing at least two kind of pitches to spin them as single fibers, bundling the thus spun single fibers to form a fiber bundle, then infusibilizing the resulting fiber bundler under tension and carbonizing the fiber bundle.
    Type: Grant
    Filed: September 28, 1992
    Date of Patent: January 11, 1994
    Assignees: Kao Oil Co., Ltd., Tanaka Kikinzoku Kogyo Kabushiki
    Inventors: Eiji Kitajima, Takashi Oyama, Eiji Maruden, Hirokazu Teraoka, Haruki Yamasaki, Susumu Shimizu
  • Process for producing a coil-shaped carbon fiber bundle
    Patent number: 5183603
    Abstract: The present invention relates to a carbon fiber bundle comprising a regular coil-shaped fiber bundle and having excellent stretch characteristic. A process for producing a coil-shaped carbon fiber bundle according to the present invention comprises the steps of compositing at least two kind of pitches to spin them as single fibers, bundling the thus spun single fibers to form a fiber bundle, then infusibilizing the resulting fiber bundle under tension and carbonizing the fiber bundle.
    Type: Grant
    Filed: October 22, 1991
    Date of Patent: February 2, 1993
    Assignees: Koa Oil Company Limited, Tanaka Kikinzoku Kogyo Kabushiki Kaisha
    Inventors: Eiji Kitajima, Takashi Oyama, Eiji Maruden, Hirokazu Teraoka, Haruki Yamasaki, Susumu Shimizu