Patents by Inventor Yoshifusa Ueno

Yoshifusa Ueno 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).

  • Crystal resonator with plural electrodes for use in a crystal oscillating device of a temperature compensation type
    Patent number: 5132643
    Abstract: A crystal resonator with plural electrodes comprises a crystal piece, first, second and third pairs of electrodes. The crystal piece causes shear vibration. The first electrode pair is provided in the center of the crystal piece and coupled to a variable impedance. The second and third electrode pairs are provided on both sides of the first electrode pair. The second and third electrode pairs are electrically connected together and are coupled to an oscillation circuit.
    Type: Grant
    Filed: February 22, 1991
    Date of Patent: July 21, 1992
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Yoshifusa Ueno, Hiroaki Ishii, Hiroshi Shimizu
  • Quartz crystal oscillator with temperature-compensated frequency characteristics
    Patent number: 5004988
    Abstract: A temperature-compensated quartz crystal oscillator has two or more temperature compensating units. The first temperature compensating unit compensates the frequency-temperature characteristics of the oscillator over its rated temperature range. The other temperature compensating units further independently compensate the frequency-temperature characteristics of the oscillator within respective specific temperature regions of the compensated frequency-temperature characteristics to obtain desired frequency-temperature characteristics for the crystal oscillator.
    Type: Grant
    Filed: July 19, 1989
    Date of Patent: April 2, 1991
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Yoshifusa Ueno, Takihei Tanzawa, Takayuki Suzuki