Patents by Inventor Motoo Sato

Motoo Sato 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).

  • Driving apparatus for DC circuit breakers
    Patent number: 4862313
    Abstract: A driving apparatus for a DC circuit breaker of reverse current insertion type. The driving apparatus includes a magnetic repulsive coil for instantaneously driving a movable electrode of a vacuum valve directly in an opening direction, and a first coil of capacitor energization type and a second coil for voltage tripping purposes as trip coils for an operating mechanism connected to the movable electrode through a contact spring whereby the magnetic repulsive coil and the first trip coil are respectively energized by capacitors in the case of tripping under faulty conditions and only the second trip coil is energized in the case of tripping under other conditions than faulty conditions.
    Type: Grant
    Filed: December 8, 1988
    Date of Patent: August 29, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Tatsuji Shirouzu, Tatsuo Takahashi, Motoo Sato, Satoshi Mizuno