Patents by Inventor Takaaki Higashiizumi

Takaaki Higashiizumi 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).

  • Method for producing isotropic pitch, activated carbon fibers and carbon materials for non-aqueous secondary battery anodes
    Patent number: 6228343
    Abstract: A method for preparing a modified optically isotropic pitch comprising, preparing a synthetic pitch by reacting a member selected from the group consisting of a conjugated polycyclic hydrocarbon containing a low molecular weight alkyl group or a material containing such a substituted hydrocarbon in the presence of hydrofluoric acid/boron trifluoride, and treating the synthetic pitch by passing an oxidizing gas through the synthetic pitch at elevated temperatures.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: May 8, 2001
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Takahumi Yoshimura, Koichi Kanno, Yasuhiro Hirai, Yukio Sakai, Nobuyuki Koike, Yuzuru Takahashi, Hitoshi Sakamoto, Jitsuo Oishi, Takaaki Higashiizumi, Kyoko Shibahara
  • Method for producing isotropic pitch, activated carbon fibers and carbon materials for non-aqueous secondary battery anodes
    Patent number: 5944980
    Abstract: A method for preparing a modified optically isotropic pitch comprising, preparing a synthetic pitch by reacting a member selected from the group consisting of a conjugated polycyclic hydrocarbon containing a low molecular weight alkyl group or a material containing such a substituted hydrocarbon in the presence of hydrofluoric acid/boron trifluoride, and treating the synthetic pitch by passing an oxidizing gas through the synthetic pitch at elevated temperatures.
    Type: Grant
    Filed: September 5, 1997
    Date of Patent: August 31, 1999
    Assignee: Mitsubishi Gas Chemical Company Co., Inc.
    Inventors: Takahumi Yoshimura, Koichi Kanno, Yasuhiro Hirai, Yukio Sakai, Nobuyuki Koike, Yuzuru Takahashi, Hitoshi Sakamoto, Jitsuo Oishi, Takaaki Higashiizumi, Kyoko Shibahara