Patents Assigned to Mitsubishi Gas Chemical Company Co., Inc.
  • 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