Patents by Inventor Hiroshi Shinoto

Hiroshi Shinoto 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).

  • Dual piston reciprocating vacuum pump
    Patent number: 5252045
    Abstract: A reciprocating vacuum pump characterized in that each part to be lubricated of a crank moving portion and piston moving portions is made oilless, two pistons in the piston moving portions being formed so that their load working lines are aligned, a suction exhaust valve being provided on each of the two pistons. This pump may have a multistage structure in which two pistons extend in a horizontally opposed state. The reciprocating vacuum pump thus constructed is small in size and light in weight, and is substantially free from vibration.
    Type: Grant
    Filed: April 26, 1991
    Date of Patent: October 12, 1993
    Assignees: Toyo Engineering Corporation, Mikuni Jukogyo Co., Ltd.
    Inventors: Hiroshi Shinoto, Nobuhisa Okuyama