Patents by Inventor Katsutoshi Fujisawa

Katsutoshi Fujisawa 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).

  • Patent number: 8993197
    Abstract: A bipolar plate for a fuel cell comprises a substrate formed of stainless steel; an oriented amorphous carbon film formed at least on a surface of the substrate facing an electrode, and containing C as a main component, 3 to 20 at. % of N, and more than 0 at. % and not more than 20 at. % of H, and when the total amount of the C is taken as 100 at. %, the amount of C having an sp2 hybrid orbital (Csp2) being not less than 70 at. % and less than 100 at. %, and (002) planes of graphite being oriented along a thickness direction; a mixed layer generated in an interface between the substrate and the oriented amorphous carbon film and containing at least one kind of constituent atoms of each of the substrate and the oriented amorphous carbon film; and a plurality of projections protruding from the mixed layer into the oriented amorphous carbon film and having a mean length of 10 to 150 nm.
    Type: Grant
    Filed: December 24, 2010
    Date of Patent: March 31, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takashi Iseki, Kazuyuki Nakanishi, Yasuhiro Ozawa, Yuka Yamada, Hajime Hasegawa, Masafumi Koizumi, Katsutoshi Fujisawa, Naoki Ueda, Hirohiko Hisano
  • Publication number: 20120231374
    Abstract: A bipolar plate for a fuel cell comprises a substrate formed of stainless steel; an oriented amorphous carbon film formed at least on a surface of the substrate facing an electrode, and containing C as a main component, 3 to 20 at. % of N, and more than 0 at. % and not more than 20 at. % of H, and when the total amount of the C is taken as 100 at. %, the amount of C having an sp2 hybrid orbital (Csp2) being not less than 70 at. % and less than 100 at. %, and (002) planes of graphite being oriented along a thickness direction; a mixed layer generated in an interface between the substrate and the oriented amorphous carbon film and containing at least one kind of constituent atoms of each of the substrate and the oriented amorphous carbon film; and a plurality of projections protruding from the mixed layer into the oriented amorphous carbon film and having a mean length of 10 to 150 nm.
    Type: Application
    Filed: December 24, 2010
    Publication date: September 13, 2012
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takashi Iseki, Kazuyuki Nakanishi, Yasuhiro Ozawa, Yuka Yamada, Hajime Hasegawa, Masafumi Koizumi, Katsutoshi Fujisawa, Naoki Ueda, Hirohiko Hisano