Patents Assigned to Piezo Technology Inc.
  • 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
  • Guided elastic surface wave filter
    Patent number: 4060777
    Abstract: A resonator and resonator type wave filter formed by a piezoelectric body on which acoustic surface waves are guided and reflected and in which mode coupling in a direction transverse to the surface wave propagation is utilized. The transverse modes are controlled so as to provide improved response characteristics by minimizing suppressing and/or otherwise controlling unwanted modes of vibration in the body.
    Type: Grant
    Filed: May 19, 1976
    Date of Patent: November 29, 1977
    Assignee: Piezo Technology Inc.
    Inventors: Harry Frank Tiersten, Robert Chastain Smythe