Patents by Inventor Tohru Ohyama

Tohru Ohyama 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).

  • RF Modulator
    Patent number: 4500920
    Abstract: In furnishing an RF modulator with a reference signal generator for generating a specified test signal, and a switching circuit for switching a video signal and the test signal on occasion; the reference signal generator and the switching circuit are received in a shield case of the RF modulator, thereby to prevent radiated interferences.
    Type: Grant
    Filed: July 1, 1982
    Date of Patent: February 19, 1985
    Assignee: Alps Electric Co., Ltd.
    Inventors: Tohru Ohyama, Shigeru Nigorikawa