Patents by Inventor Koji Hotta

Koji Hotta 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).

  • Flow meter with helical toothed rotors having no pulsation and zero contact pressure
    Patent number: 4329130
    Abstract: This invention relates to a positive displacement flow meter with helical toothed rotors, in which respective tooth profiles are continuously contacted with each other in order not to cause any blockage of fluid between the respective tooth profile curves. The flow meter has a pair of helical toothed rotors which are rotatable each other with no pulsation and the tooth-to-tooth surface contact pressure is maintained zero. Each of the two rotors has the same profile and the same size. Further, a plurality of curved projections can be mounted on a tooth profile of each rotor.
    Type: Grant
    Filed: July 2, 1979
    Date of Patent: May 11, 1982
    Assignee: Oval Engineering Company Limited
    Inventors: Shigeyoshi Nagata, Koji Hotta