Patents by Inventor Hiroshi Hujii

Hiroshi Hujii 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).

  • Device for energizing a hermetic motor using inverter
    Patent number: 4806839
    Abstract: A hermetic box contains a motor and a self reset type protector which interrupts the supply of electric power to the motor when an abnormally heated condition takes place in the hermetic box and automatically supplies again the electric power when the abnormally heated condition ceases. The motor is energized by an inverter having AC output terminals connected to the motor outside of the hermetic box. A current detector which detects that no current is flowing into the motor is provided on the output side of the inverter outside for a hermetic box.
    Type: Grant
    Filed: June 18, 1987
    Date of Patent: February 21, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Yuichiro Nagato, Hiroshi Hujii, Osamu Matsumoto, Katsuhiko Saito