Patents by Inventor Nobuo Fukumoto

Nobuo Fukumoto 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).

  • Audio power amplifier
    Patent number: 4087761
    Abstract: An audio power amplifier can be operated in either class A, class B or class AB amplifier modes by selectively switching bias values set in a bias setting circuitry provided for a driver stage which drives the main power amplifier stage.
    Type: Grant
    Filed: June 24, 1976
    Date of Patent: May 2, 1978
    Assignee: Nippon Gakki Seizo Kabushiki Kaisha
    Inventors: Nobuo Fukumoto, Mitsugo Ohiwa, Teruyoshi Matsui, Hajime Ohta