Patents by Inventor Shunichi Koike

Shunichi Koike 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).

  • Gate-turn-off thyristor failure detecting circuit
    Patent number: 4600917
    Abstract: A gate-turn-off thyristor failure detecting circuit includes a detector which detects an off-gate signal for a gate-turn-off thyristor and a current level detector which compares the signal with a predetermined value and produces an output signal indicative of the failure of the gate-turn-off thyristor.
    Type: Grant
    Filed: October 31, 1983
    Date of Patent: July 15, 1986
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Nagataka Seki, Shunichi Koike, Yukio Watanabe