Patents by Inventor Yoichi Ohshita

Yoichi Ohshita 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).

  • Gas-insulated switchgear with improved insulation joint
    Patent number: 5670767
    Abstract: A gas-insulated switchgear in which a washer 5 is electrically connected with a tank 1 by a conductive material 12 having a high resistivity at a position where the tank 1 and a tank 2 are joined through an insulator 13 of the gas-insulated switchgear. In view of the structure of the switchgear, the reliability is improved, the structure is simplified, the number of parts is decreased, and the profitability is improved because a steep surge is not theoretically induced for a steep surge induced when turning on/off each unit at an electrically insulated position of a joint between tanks through an insulator of a gas-insulated switchgear for an SF.sub.6 gas-insulated closed-type station.
    Type: Grant
    Filed: August 23, 1995
    Date of Patent: September 23, 1997
    Assignee: Hitachi, Ltd.
    Inventors: Masatomo Kobayashi, Hiromichi Hokuto, Yoichi Ohshita, Minoru Sakaguchi