Patents by Inventor Haruo Hirikawa

Haruo Hirikawa 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).

  • Rolling stock ventilator and its control method
    Patent number: 5439415
    Abstract: A rolling stock ventilator including an air supply fan, an exhaust fan an inverter for changing air feed characteristics of the air supply fan and the exhaust fan. Flow path resistance changers, a tunnel detector to detect the presence of a tunnel, and a car internal pressure detector are also provided. A controller provides signals to the inverters and the flow path resistance changers with the signals representing a control command to change the operation frequency of the air supply fan and the exhaust fan in accordance with the result of a detection by the tunnel detector and the car internal pressure detector and also provides a control command to change the air feed resistance of the flow path resistance changers.
    Type: Grant
    Filed: February 28, 1994
    Date of Patent: August 8, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Haruo Hirikawa, Shinichiroo Ishikawa, Sumio Okuno, Morishige Hattori, Masakazu Matsumoto