Patents by Inventor Harutoshi Hashimoto

Harutoshi Hashimoto 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).

  • Speed control apparatus
    Patent number: 4176306
    Abstract: A speed control apparatus includes a plurality of switches disposed between a three phase AC power source and a motor, a low speed control device for feeding power having a frequency lower than the frequency of the power source to the motor under the turn-on control of the switches, and a phase shifting device for shifting the phase order for changing from high speed operation to low speed operation of the motor.
    Type: Grant
    Filed: April 27, 1978
    Date of Patent: November 27, 1979
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tetsumasa Asano, Osamu Yatsuki, Kazuyuki Fujimoto, Harutoshi Hashimoto