Patents by Inventor Kazumasa Otao

Kazumasa Otao 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).

  • Power amplifier circuitry
    Patent number: 4334197
    Abstract: A single-ended, push-pull, power amplifier circuit where switching distortion due to transistors and diodes is lessened.
    Type: Grant
    Filed: June 12, 1980
    Date of Patent: June 8, 1982
    Assignee: Trio Kabushiki Kaisha
    Inventor: Kazumasa Otao
  • Power limiting circuitry for use with power amplifier
    Patent number: 4146847
    Abstract: Power limiting circuitry for use with a power amplifier, the power amplifier having (a) a power supply voltage source connected thereto and (b) a load impedance, the power limiting circuitry comprising detecting means for detecting the magnitude of the load impedance; and control means responsive to the detecting means for controlling the magnitude of the power supply voltage applied to the power amplifier; means for sensing the temperature at a predetermined point in the power amplifier and generating an output signal when the temperature exceeds a predetermined amount; and AND circuit means responsive to the detecting means and the temperature sensing means for actuating the control means in response thereto.
    Type: Grant
    Filed: October 28, 1977
    Date of Patent: March 27, 1979
    Assignee: Trio Kabushiki Kaisha
    Inventors: Kazumasa Otao, Kaku Sakaida