Patents by Inventor Yasuharu Tsuyama

Yasuharu Tsuyama 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).

  • Two-stroke engine having variable exhaust port timing
    Patent number: 4202297
    Abstract: Two-stroke engine having variable exhaust timing, which includes an exhaust timing control member disposed in the exhaust passage in the vicinity of the exhaust port. The member is of an elongated configuration having a diameter gradually decreasing from the opposite ends to the intermediate portion to provide an external contour of an arcuate sectional configuration. The member is divided into two parts at the intermediate portion in order to facilitate to assemble it in the engine.
    Type: Grant
    Filed: June 19, 1978
    Date of Patent: May 13, 1980
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Yuji Oku, Yasuharu Tsuyama