Patents by Inventor Kunio Shibayama

Kunio Shibayama 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).

  • Snubber circuit for power conversion semiconductor elements and assembly thereof
    Patent number: 5055990
    Abstract: A snubber network of high energy efficiency for use with power conversion semiconductors is described. Asymmetrical semiconductor elements are used to reduce and dissipate voltage spikes induced by stray inductance during turn-off of power semiconductors. A space efficient assembly using the described snubber network containing asymmetrical semiconductor elements and an external snubber capacitor is also described.
    Type: Grant
    Filed: January 17, 1990
    Date of Patent: October 8, 1991
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Hiroshi Miki, Yoshitaka Fujiwara, Kiyoshi Iida, Hiromu Takubo, Kunio Shibayama, Shinichi Kobayashi
  • Current collector shoe suspension for externally powered electric vehicle
    Patent number: 4108288
    Abstract: A current collector shoe suspension for sliding contact with an electric power line in an externally powered electric vehicle. Current collecting shoes are resiliently biased toward a power rail through a plurality of interconnected vibration absorbing units pivotally mounted to the vehicle. Each unit can vibrate independently of the others, and the units have different resonance points so displaced that their vibration characteristic curves overlap, whereby the shoes maintain contact with the rail over a wide range of vibration frequencies and amplitudes.
    Type: Grant
    Filed: July 6, 1977
    Date of Patent: August 22, 1978
    Assignees: Fuji Electric Co., Ltd., Japanese National Railways
    Inventors: Katsushi Manabe, Fumio Nakama, Kunio Shibayama