Patents by Inventor Akio Tokumo

Akio Tokumo 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).

  • Noise suppression system
    Patent number: 4258329
    Abstract: A noise suppression device for automobile stereo components having a noist suppression circuit interposed between the output of the audio source and the input of the amplifier section. The suppression circuit has a differential amplifier or an operational amplifier to eliminate noise from the source. In a multi-amplifier system the noise suppression device is interposed between the pre-amplifier and the primary amplifiers.
    Type: Grant
    Filed: March 21, 1979
    Date of Patent: March 24, 1981
    Assignee: Pioneer Electronic Corporation
    Inventor: Akio Tokumo