Patents by Inventor Shunzo Fujiwara

Shunzo Fujiwara 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).

  • Four-cycle engine
    Patent number: 5660155
    Abstract: An engine induction system having a check valve upstream of the intake port for precluding reverse flow. A plenum device is communicated with the induction system downstream of the check valve for reducing inertial effects and improving charging efficiency. The plenum device may be the crankcase chamber of the engine. In that case crankcase ventilation may also be controlled and improved. Crankcase supercharging may also be generated. These features may be combined with variable valve timing to further improve engine performance.
    Type: Grant
    Filed: September 21, 1995
    Date of Patent: August 26, 1997
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Jun Taue, Shunzo Fujiwara