Patents by Inventor Toyoshi Harada

Toyoshi Harada 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).

  • Flat frequency, constant voltage power source device
    Patent number: 4937463
    Abstract: A flat frequency, constant voltage power source device provided for parallel operation of a plurality of electric generators is arranged to have a starting sequence determination means which automatically determines which one of the electric generators is to be started initially and places the remaining ones of the electric generators sequentially into the parallel operation with the initially started generator, the plurality of the electric generators sequentially satisfying conditions for their parallel operation and being smoothly placed in parallel operation.
    Type: Grant
    Filed: June 19, 1989
    Date of Patent: June 26, 1990
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Koichi Kobayashi, Toyoshi Harada