Patents by Inventor Tsugitaka Hanaie

Tsugitaka Hanaie 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).

  • Oscillation control apparatus for ultrasonic oscillator
    Patent number: 5001442
    Abstract: In an oscillation control apparatus for an ultrasonic oscillator, an FET circuit is connected to an oscillation circuit for varying a resistant value of a resistor unit of the oscillation circuit, which determines a free-running frequency thereof. A phase-difference detecting circuit is provided for detecting a relative phase difference between voltage and current in the ultrasonic oscillator. A threshold discrimination circuit outputs a signal when the phase difference inputted from the phase-difference detecting circuit exceeds at least a predetermined value. A pump circuit integrates the signal from the threshold discrimination circuit. A resistant value of the FET circuit varies when an output signal from the pump circuit exceeds a predetermined value.
    Type: Grant
    Filed: May 1, 1990
    Date of Patent: March 19, 1991
    Assignee: Stanley Electric Co., Ltd.
    Inventors: Tsugitaka Hanaie, Kunio Iwaki, Yorimi Yokoyama