Patents by Inventor Shinichirou Ishikawa

Shinichirou Ishikawa 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).

  • Ventilating equipment for railway rolling stock and operating method thereof
    Patent number: 5137490
    Abstract: Ventilating equipment for railway rolling stock including a low-pressure supply air blower, a high-pressure supply air blower, a low-pressure exhaust air blower, and a high-pressure exhaust air blower. This ventilating equipment ventilates car interior during travel of a train outside of tunnels by the low-pressure supply air blower and the low-pressure exhaust air blower, and also ventilates the car interior during travel in tunnels by the high-pressure supply air blower and the high-pressure exhaust air blower. The high-pressure supply air blower and the high-pressure exhaust air blower produce a higher discharge pressure than a changing external pressure during a high-speed travel in tunnels, thereby preventing the propagation of an influence of the changing external pressure into the car interior.
    Type: Grant
    Filed: March 19, 1991
    Date of Patent: August 11, 1992
    Assignee: Hitachi, Ltd.
    Inventors: Shinichirou Ishikawa, Toshiharu Matsuda, Haruo Hirakawa, Hiroshi Higaki, Atsushi Ikio, Masakazu Matsumoto