Patents by Inventor Yoshiki Hirano

Yoshiki Hirano 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 mechanism of a circuit breaker
    Patent number: 5353594
    Abstract: In a driving mechanism of a circuit breaker having first and second hydraulic operation apparatuses respectively driving a main contact and a resistor contact, a sequential control valve is provided between the first and second hydraulic operation apparatuses. The sequential control valve detects the operation of a differential piston for opening the main contact and switching the differential piston for sequentially opening the resistor contact after the opening of the main contact.
    Type: Grant
    Filed: April 22, 1993
    Date of Patent: October 11, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Toru Yamashita, Yoshiki Hirano
  • Circuit breaker
    Patent number: 5354959
    Abstract: A double-break type circuit breaker includes two resistor contacts which are to be connected in parallel with respectively two main contacts when the main contacts are closed. An engagement mechanism is provided for linking the main contacts operated by a first hydraulic operation apparatus and the resistor contacts operated by a second hydraulic operation apparatus.
    Type: Grant
    Filed: March 19, 1993
    Date of Patent: October 11, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Toshiaki Yoshizumi, Mikio Hidaka, Yoshiki Hirano