Patents by Inventor Haruhiko Kikawa

Haruhiko Kikawa 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).

  • Material for liquid-crystal alignment film, liquid-crystal display element, process for its production and liquid-crystal display unit
    Patent number: 6753048
    Abstract: A material for a liquid-crystal alignment film which comprises as a first polyamide a C3 to C10 alkyl ester of a polyamic acid whose acid anhydride residual group is any of: and as a second polyamide a C3 to C10 alkyl ester of a polyamic acid whose acid anhydride residual group is: is provided. The use of this material materializes a liquid-crystal alignment film having a high pre-tilt angle of molecules to the substrate, and having superiority in respect of electrical properties such as voltage holding ratio and residual DC voltage, adherence to substrates, printability, and step-covering properties.
    Type: Grant
    Filed: September 27, 2002
    Date of Patent: June 22, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Nobuhito Katsumura, Haruhiko Kikawa, Takashi Inoue, Masahiro Yamada, Yasuo Koike, Nobuhiko Fukuoka, Hiromu Terao
  • Material for liquid-crystal alignment film, liquid-crystal display element, process for its production and liquid-crystal display unit
    Patent number: 6720040
    Abstract: A material for a liquid-crystal alignment film which comprises as a first polyamide a C3 to C10 alkyl ester of a polyamic acid whose acid anhydride residual group is any of: and as a second polyamide a C3 to C10 alkyl ester of a polyamic acid whose acid anhydride residual group is: is provided. The use of this material materializes a liquid-crystal alignment film having a high pre-tilt angle of molecules to the substrate, and having superiority in respect of electrical properties such as voltage holding ratio and residual DC voltage, adherence to substrates, printability, and step-covering properties.
    Type: Grant
    Filed: September 12, 2001
    Date of Patent: April 13, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Nobuhito Katsumura, Haruhiko Kikawa, Takashi Inoue, Masahiro Yamada, Yasuo Koike, Nobuhiko Fukuoka, Hiromu Terao
  • Material for liquid-crystal alignment film, liquid-crystal display element, process for its production and liquid-crystal display unit
    Publication number: 20030108686
    Abstract: A material for a liquid-crystal alignment film which comprises as a first polyamide a C3 to C10 alkyl ester of a polyamic acid whose acid anhydride residual group is any of: 1
    Type: Application
    Filed: September 27, 2002
    Publication date: June 12, 2003
    Inventors: Nobuhito Katsumura, Haruhiko Kikawa, Takashi Inoue, Masahiro Yamada, Yasuo Koike, Nobuhiko Fukuoka, Hiromu Terao
  • Material for liquid-crystal alignment film, liquid-crystal display element, process for its production and liquid-crystal display unit
    Publication number: 20030021914
    Abstract: A material for a liquid-crystal alignment film which comprises as a first polyamide a C3 to C10 alkyl ester of a polyamic acid whose acid anhydride residual group is any of: 1
    Type: Application
    Filed: September 12, 2001
    Publication date: January 30, 2003
    Inventors: Nobuhito Katsumura, Haruhiko Kikawa, Takashi Inoue, Masahiro Yamada, Yasuo Koike, Nobuhiko Fukuoka, Hiromu Terao