Patents by Inventor Kazuhito Tsukahara

Kazuhito Tsukahara 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).

  • Actual operating time indicator
    Patent number: 5329468
    Abstract: An actual operating time indicator includes: a lifting motor for lifting a load up/down; a power detection unit for detecting an input power based on a current and a voltage supplied to the motor, and converting the input power into a first voltage proportional to the input power; a voltage-to-periodic pulse conversion unit connected to the power detection unit for receiving the first voltage and converting the first voltage into the periodic pulse proportional to the first voltage; a counter unit connected to the voltage-to-periodic pulse conversion unit for counting and integrating the periodic pulse to obtain an integrated power; and a display operatively connected to the counter unit for indicating the integrated power as an actual operating time of the motor.
    Type: Grant
    Filed: March 1, 1993
    Date of Patent: July 12, 1994
    Assignee: Kabushiki Kaisha Kito
    Inventors: Kazuhito Tsukahara, Hisatsugu Watanabe