Patents by Inventor Kunihiro Usami

Kunihiro Usami 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).

  • Directional coupler and electronic device using the same
    Patent number: 6972638
    Abstract: A directional coupler includes a transmission line, and a coupling line, the transmission line being coupled with the coupling line. The transmission line is located at a height position different from that of the coupling line with respect to a reference plane. The transmission line and the coupling line have portions that do not overlap each other.
    Type: Grant
    Filed: June 18, 2003
    Date of Patent: December 6, 2005
    Assignee: Fujitsu Quantum Devices Limited
    Inventors: Kunihiro Usami, Toshiaki Moriuchi
  • Directional coupler and electronic device using the same
    Publication number: 20040000965
    Abstract: A directional coupler includes a transmission line, and a coupling line, the transmission line being coupled with the coupling line. The transmission line is located at a height position different from that of the coupling line with respect to a reference plane. The transmission line and the coupling line have portions that do not overlap each other.
    Type: Application
    Filed: June 18, 2003
    Publication date: January 1, 2004
    Applicant: FUJITSU QUANTUM DEVICES LIMITED
    Inventors: Kunihiro Usami, Toshiaki Moriuchi
  • Frequency dividing circuit
    Patent number: 5572561
    Abstract: A frequency dividing circuit includes a first inverter circuit supplied with a first frequency-divided signal, a second inverter circuit supplied with a second frequency-divided signal which has a complementary relationship to the first frequency-divided signal, and a first pair of push-pull circuits. There are also provided a first switch circuit performing a first switching operation in response to a first input signal and selectively supplying output signals of the first and second inverter circuits to the first pair of push-pull circuits so that one of the first pair of push-pull circuits performs a pull-up operation when the other one thereof performs a pull-down operation.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: November 5, 1996
    Assignee: Fujitsu Limited
    Inventors: Kunihiro Usami, Miki Kubota