Patents by Inventor Chushiroh Kusano

Chushiroh Kusano 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).

  • Hetero junction bipolar transistor with improved electrode wiring contact region
    Patent number: 5296733
    Abstract: A hetero junction bipolar transistor provides a contact area an area between an emitter (or collector) electrode and a wiring formed on the electrode that is larger than that of the emitter (or collector). A variation in voltage applied to an emitter (or collector)-base junctions is prevented and a stable operation of the transistor is attained. In addition, when an etching operation is carried out, an insulation film is formed on a side part of a mask. A patterning of the emitter (or collector) is then carried out and thus an emitter (or collector) having a size approximate to that of the mask is formed.
    Type: Grant
    Filed: November 19, 1990
    Date of Patent: March 22, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Chushiroh Kusano, Hiroshi Masuda, Katsuhiko Mitani, Kazuhiro Mochizuki, Masaru Miyazaki, Masahiko Kawata, Susumu Takahashi