Patents by Inventor Toshirou Izuchi

Toshirou Izuchi 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).

  • Electret condenser microphone unit
    Patent number: 5272758
    Abstract: An electret film is formed on the rear side of a front face plate of a cylindrical capsule made of aluminum . Closely in spaced opposition thereto, an electrically conductive diaphragm is held by an electrically conductive holding member. A wiring board provided behind the holding member closes the rear end of the capsule. The rear end of the capsule is bent on the rear periphery of the wiring board, and calked thereat. In the capsule, an impedance conversion IC device is connected to the electrically conductive holding member and the wiring board.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: December 21, 1993
    Assignee: Hosiden Corporation
    Inventors: Shuzo Isogami, Mamoru Yasuda, Kouji Nishikawa, Toshirou Izuchi, Kazuo Ono, Kiyoshi Ohta