Patents by Inventor Hirokazu Teraoka

Hirokazu Teraoka 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
  • Apparatus for production of crystallizable carbonaceous material
    Patent number: 4769139
    Abstract: A heavy oil such as an atmospheric pressure residue, a reduced pressure residue of petroleum, etc. is heated to 400.degree. to 500.degree. C. to carry out polycondensation and provide a pitch containing mesophase microspheres. This pitch is once cooled to 200.degree. to 400.degree. C. and a turbulent flow is imparted thereto to cause agglomeration of the mesophase microspheres. The resulting agglomerates are separated to obtain a crystallizable material enriched with quinoline insolubles. Production of the crystallizable material is preferably conducted in a separation tank accommodating the lower part of a heating polycondensation reactor (6) and having a stirring device (12).
    Type: Grant
    Filed: February 14, 1986
    Date of Patent: September 6, 1988
    Assignee: Koa Oil Company, Limited
    Inventors: Kosaku Noguchi, Honami Tanaka, Yukimasa Kumura, Eiji Kitajima, Toshifumi Ishitobi, Hirokazu Teraoka
  • Method and apparatus for production of crystallizable carbonaceous material
    Patent number: 4488957
    Abstract: A heavy oil such as an atmospheric pressure residue, a reduced pressure residue of petroleum, etc. is heated to 400.degree. to 500.degree. C. to carry out polycondensation and provide a pitch containing mesophase microspheres. This pitch is once cooled to 200.degree. to 400.degree. C. and a turbulent flow is imparted thereto to cause agglomeration of the mesophase microspheres. The resulting agglomerates are separated to obtain a crystallizable material enriched with quinoline insolubles. Production of the crystallizable material is preferably conducted in a separation tank accommodating the lower part of a heating polycondensation reactor (6) and having a stirring device (12).
    Type: Grant
    Filed: May 26, 1982
    Date of Patent: December 18, 1984
    Assignee: Koa Oil Company, Ltd.
    Inventors: Kosaku Noguchi, Honami Tanaka, Yukimasa Kumura, Eiji Kitajima, Toshifumi Ishitobi, Hirokazu Teraoka