Patents by Inventor Kikuo Miyahara

Kikuo Miyahara 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).

  • Rotational speed control circuit for motor
    Patent number: 6396238
    Abstract: A rotational speed control circuit for a motor capable of restraining generation of switching noise and vibration during low-speed rotation of the motor. The circuit includes capacitors which are charged when two transistors are kept turned on and carries out discharge through a base of one of the transistor switches when control signals are ready to turn off the transistor switches. Additional two transistors switches are connected in series to the capacitors and adapted to be kept turned on during a low-speed period and turned off during the remaining period.
    Type: Grant
    Filed: May 25, 2000
    Date of Patent: May 28, 2002
    Assignee: Sanyo Denki Co., Ltd.
    Inventor: Kikuo Miyahara