Patents Assigned to Hokuryo Denko Co., Ltd.
  • CATV Pay system
    Patent number: 4486773
    Abstract: A two-way CATV system comprising a central equipment, a plurality of television receiver sets each disposed with a terminal unit and a wired two-way transmission channel provided between the central equipment and each of the terminal units.
    Type: Grant
    Filed: May 24, 1982
    Date of Patent: December 4, 1984
    Assignee: Hokuryo Denko Co., Ltd.
    Inventor: Kazutomo Okubo
  • Fee-charging apparatus for television sets
    Patent number: 4085422
    Abstract: An apparatus with specified video carrier jamming for disturbing the image on a screen of a TV receiver for Fee-charged Viewing Thereof comprises an oscillating circuit, a switch means, a feeding device and a mixer circuit, and the said mixer circuit combines a video carrier with the output of said oscillating circuit.
    Type: Grant
    Filed: June 30, 1976
    Date of Patent: April 18, 1978
    Assignee: Hokuryo Denko Co., Ltd.
    Inventors: Tatuji Niwata, Kazutomo Okubo, Fumio Nakanishi, Masanori Yamada