Patents by Inventor Yasumi Ooba

Yasumi Ooba 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).

  • Apex seal device for use in rotary piston engine
    Patent number: 4076261
    Abstract: An apex seal device includes an apex seal fitted in an apex seal groove defined in a crest portion of a rotor and an apex seal spring confined between the bottom surface of the apex seal groove and the bottom surface of the apex seal, the bottom surface of the apex seal being so inclined to the horizontal line in its cross section parallel with the rotating plane of the rotor that a component of a force exerted by said spring in the direction perpendicular to the radial center line of the apex seal is directed opposite to the rotating direction of the rotor.
    Type: Grant
    Filed: October 16, 1974
    Date of Patent: February 28, 1978
    Inventor: Yasumi Ooba