Patents by Inventor Haruo Tsubota

Haruo Tsubota 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).

  • Pressure differential switch device
    Patent number: 4084072
    Abstract: A pressure differential switch device having a flexible diaphragm between two chambers subject to differential pressures and a permanent magnet movable with the diaphragm against a biasing force when pressure differences occur in the chambers; the magnet moving to a position in which the magnetic field of the magnet actuates the contacts of a reed switch assembly.
    Type: Grant
    Filed: May 12, 1976
    Date of Patent: April 11, 1978
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Haruo Tsubota, Katsuki Takayama, Naoji Sakakibara, Nobuyuki Hashimoto