Patents by Inventor Hirano Seiji

Hirano Seiji 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).

  • Exhaust means for two cycle engines
    Patent number: 4121552
    Abstract: Two cycle internal combustion engines including a cylinder which is provided with one or more exhaust ports adapted to be closed by piston reciprocating in the cylinder. A valve member is provided in co-operation with the upper portion or upper one of the exhaust ports. Said valve member may be interconnected with the engine throttle valve in such a manner that it is closed under lower speed operation and opened under high speed operation of the engine so as to obtain optimum exhaust valve timing throughout the engine operating speed range.
    Type: Grant
    Filed: March 25, 1977
    Date of Patent: October 24, 1978
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Nagahama Mithuo, Aoi Kazuo, Hirano Seiji