Patents by Inventor Tomoshisa Yokogawa

Tomoshisa Yokogawa 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).

  • Input signal level control device for receiver
    Patent number: 4393513
    Abstract: An input signal level control device for a receiver particularly adapted for use in a mobile FM receiver in which the received electric field strength changes abruptly and greatly. An attenuating device such as a switching diode is coupled to an input of a high frequency amplifier to which the input received signal is fed. The attenuating device switches on when the received electric field strength reaches the first predetermined value. As the electric field strength continues to increase and reaches a second value greater than the first, a control circuit controls the gain of the high frequency amplifier in accordance with the electric field strength.
    Type: Grant
    Filed: May 14, 1981
    Date of Patent: July 12, 1983
    Assignee: Pioneer Electric Corporation
    Inventors: Tomoshisa Yokogawa, Shintaro Gomi