Patents by Inventor Kenzo Yamamoto, legal representative

Kenzo Yamamoto, legal representative 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).

  • Reverse conducting semiconductor device and a fabrication method thereof
    Patent number: 7400017
    Abstract: To provide a reverse conducting semiconductor device in which an insulated gate bipolar transistor and a free wheeling diode excellent in recovery characteristic are monolithically formed on a substrate, the free wheeling diode including; a second conductive type base layer to constitute the insulated gate bipolar transistor; a first conductive type base layer for constituting the insulated gate bipolar transistor, an anode electrode which is an emitter electrode covering a first conductive type emitter layer and the second conductive type base layer, a cathode electrode which is a collector electrode covering the first conductive type base layer and a second conductive type collector layer formed on the part of the first conductive type base layer, wherein a short lifetime region is formed on a part of the first conductive type base layer.
    Type: Grant
    Filed: March 11, 2005
    Date of Patent: July 15, 2008
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shinji Aono, Kenzo Yamamoto, legal representative, Ikuko Yamamoto, legal representative, Hideki Takahashi, Aya Yamamoto