Patents by Inventor Hisashi Kuwana

Hisashi Kuwana 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 stack
    Patent number: 4492975
    Abstract: A GTO thyristor stack comprises a pair of GTO thyristors in parallel connection and a pair of diodes in anti-parallel connection therewith. The elements in one of the GTO thyristor pair and the diode pair are located in the middle of the stack structure and sandwiched by the elements in the other with all the elements stacked in electrical connection. The stack structure is clamped by a pair of clamper members.
    Type: Grant
    Filed: July 8, 1982
    Date of Patent: January 8, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Yukio Yamada, Hiroshi Itahana, Hisashi Kuwana