Patents by Inventor Zentaro Ishizaki

Zentaro Ishizaki 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).

  • Reciprocating type oil-free gas compressor
    Patent number: 4495855
    Abstract: In an oil-free multistage gas compressor comprising cylinders, a plurality of compression pistons in respective cylinders and a transmission mechanism for reciprocating said compression pistons through guide pistons serially connected to said compression pistons, the improvement wherein a common space where these pistons come in and out is defined adjacent the connections, and a diaphragm is disposed in said space transversely whereby said compression pistons are oil-tightly separated from said guide pistons.
    Type: Grant
    Filed: December 9, 1983
    Date of Patent: January 29, 1985
    Assignees: Showa Precision Machinery Co., Ltd., Kabushiki Kaisha Ecti Kenkyusho
    Inventors: Muneo Murakami, Zentaro Ishizaki