Patents by Inventor Goro Kitukawa

Goro Kitukawa 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).

  • Semiconductor decoder circuit having switching means for preventing counterflow
    Patent number: 4837462
    Abstract: The invention relates to a semiconductor device which has a high density of integration and of which a low power consumption is required. The semiconductor device prevents the influence of the amplitude of an input signal upon the amplitude of an output signal in such a way that a preceding circuit and a succeeding circuit are provided with different reference voltages. The semiconductor device is constructed of a circuit which includes a bipolar transistor and an insulated-gate field effect transistor, and which operates with reference to one or more voltages, at least one of the reference voltages having a voltage value different from a reference operating voltage of a preceding circuit.
    Type: Grant
    Filed: December 9, 1987
    Date of Patent: June 6, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Takao Watanabe, Goro Kitukawa, Ryoichi Hori, Kiyoo Itoh, Yoshiki Kawajiri, Takayuki Kawahara
  • Semiconductor device having bipolar transistor and insulated gate field effect transistor with two potential power source
    Patent number: 4730132
    Abstract: The invention relates to a semiconductor device which has a high density of integration and of which a low power consumption is required. The semiconductor device prevents the influence of the amplitude of an input signal upon the amplitude of an output signal in such a way that a preceding circuit and a succeeding circuit are provided with different reference voltages. The semiconductor device is constructed of a circuit which includes a bipolar transistor and an insulated-gate field effect transistor, and which operates with reference to one or more voltages, at least one of the reference voltages having a voltage value different from a reference operating voltage of a preceding circuit.
    Type: Grant
    Filed: July 18, 1986
    Date of Patent: March 8, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Takao Watanabe, Goro Kitukawa, Ryoichi Hori, Kiyoo Itoh, Yoshiki Kawajiri, Takayuki Kawahara