Patents by Inventor Schun'ichi Itoh

Schun'ichi Itoh 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).

  • AC type line concentrator
    Patent number: 4112260
    Abstract: An ac type line concentrator for use in a data communication system, comprising a crosspoint switch circuit. The crosspoint switch circuit is constituted by a plurality of crosspoint switches capable of switching an analog signal (hereinafter referred to as an analog switch), so that a carrier signal modulated by a data signal may be transferred from one of m incoming lines connected with m terminal units to a selected one of n(n<m) outgoing lines connected with a central unit through the ac type line concentrator without being demodulated.
    Type: Grant
    Filed: February 1, 1977
    Date of Patent: September 5, 1978
    Assignees: Hitachi Denshi Kabushiki Kaisha, Japanese National Railways, Hitachi, Ltd.
    Inventors: Takashi Kurokawa, Michio Fujiwara, Yoshio Akutsu, Akoi Otani, Harumi Nagasawa, Masujiro Matsuo, Yasuo Ishii, Sigeru Ogawa, Schun'ichi Itoh, Daisuke Takei