Patents by Inventor Tomohiro Waji

Tomohiro Waji 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).

  • Vacuum tube microphone apparatus
    Patent number: 5357577
    Abstract: A microphone apparatus including a vacuum-tube amplifier amplifying an electric signal converted from an acoustic signal includes a thermo-ionic cooling element having two surfaces, in which a first surface is in contact with the vacuum-tube amplifier for absorbing the heat generated from the vacuum-tube amplifier and the absorbed heat is radiated to the exterior from the second surface.
    Type: Grant
    Filed: September 28, 1992
    Date of Patent: October 18, 1994
    Assignee: Sony Corporation
    Inventors: Tomohiro Waji, Kazumasa Takahashi, Satoshi Yamazaki, Kiichi Yoshida, Osamu Kohno, Tohru Enokuma, Eiichi Tanaka