Patents by Inventor Keiji Nawa

Keiji Nawa 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).

  • Darlington circuit semiconductor device
    Patent number: 4138690
    Abstract: A semiconductor device comprises darlington-connected first and second transistors, a diode connected between the emitter of the first transistor and the base of the second transistor and a resistor connected in parallel to the diode -- all being formed in a single semiconductor body.
    Type: Grant
    Filed: May 10, 1977
    Date of Patent: February 6, 1979
    Assignee: Tokyo Shibaura Electric Co., Ltd.
    Inventors: Keiji Nawa, Masami Iwasaki