Patents by Inventor Shoji Shiokawa

Shoji Shiokawa 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).

  • Brake control system for automotive vehicles
    Patent number: 5273348
    Abstract: A brake control system for automotive vehicles, comprises a master cylinder, a wheel cylinder, an external hydraulic pressure source for generating an external hydraulic pressure, an electronically controlled hydraulic pressure control valve connected to the external hydraulic pressure source, for converting the external hydraulic pressure to a control pressure, a hydraulic pressure multiplier unit connected to the hydraulic pressure control valve for generating a wheel-cylinder pressure higher than the master-cylinder pressure by multiplying the control pressure, and a spool biasing force restricting mechanism for restricting the magnitude of a spool biasing force created by the master-cylinder pressure to a designated upper limit only when the master-cylinder pressure exceeds a predetermined pressure level sufficient to provide a maximum wheel-cylinder pressure.
    Type: Grant
    Filed: April 17, 1992
    Date of Patent: December 28, 1993
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Eiji Yagi, Naohiko Inoue, Shoji Shiokawa