Patents by Inventor Robert C. Smythe

Robert C. Smythe 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 having reduced acceleration sensitivity
    Patent number: 5323083
    Abstract: A crystal resonator having reduced acceleration sensitivity in which the resonator blank having one or more electrodes thereon has stiffening cover plates mounted to its top and bottom faces and spaced from the resonator blank by sidewalls.
    Type: Grant
    Filed: December 21, 1992
    Date of Patent: June 21, 1994
    Assignee: Piezo Technology, Inc.
    Inventors: Robert C. Smythe, Harry F. Tiersten
  • Crystal resonator with acceleration sensitivity adjustable by external circuit means
    Patent number: 5041754
    Abstract: A crystal resonator device having a plurality of coupled resonators in which the relative phase and magnitude of the resonator excitation currents is controlled by electrical circuit means such as reactance components connected in series with one or more of the resonators to thereby minimize or otherwise control the acceleration sensitivity of the device.
    Type: Grant
    Filed: May 9, 1990
    Date of Patent: August 20, 1991
    Assignee: Piezo Technology Inc.
    Inventor: Robert C. Smythe