Patents by Inventor Robert J. Crescenzi

Robert J. Crescenzi 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).

  • Coupled-dual resonator crystal
    Patent number: 4833430
    Abstract: A dual-coupled resonator crystal is fine-tuned by frequency balancing the input and output resonators and thereafter plating a coupling adjust spot on the grounded side shadowing the unelectroded region of the front side of the crystal to produce a change in synchronous peak separation frequency. Thereafter, the front side electrodes are sequentially plated to bring plateback and synchronous peak separation frequency to their target values. Interim adjustments in synchronous peak separation frequency may be made during the tuning process to compensate for misalignment of the plating elements.
    Type: Grant
    Filed: March 13, 1987
    Date of Patent: May 23, 1989
    Assignee: General Electric Company
    Inventors: Gerald E. Roberts, Samuel Toliver, Robert J. Crescenzi
  • Method and apparatus for selectively fine-tuning a coupled-dual resonator crystal and crystal manufactured thereby
    Patent number: 4676993
    Abstract: A dual-coupled resonator crystal is fine-tuned by frequency balancing the input and output resonators and thereafter plating a coupling adjust spot on the grounded side shadowing the unelectroded region of the front side of the crystal to produce a change in synchronous peak separation frequency. Thereafter, the front side electrodes are sequentially plated to bring plateback and synchronous peak separation frequency to their target values. Interim adjustments in synchronous peak separation frequency may be made during the tuning process to compensate for misalignment of the plating elements.
    Type: Grant
    Filed: April 11, 1986
    Date of Patent: June 30, 1987
    Assignee: General Electric Company
    Inventors: Gerald E. Roberts, Samuel Toliver, Robert J. Crescenzi
  • Piezoelectric crystal electrodes and method of manufacture
    Patent number: 4477952
    Abstract: An improved crystal is provided with an aluminum baseplate, a nickel plating on the aluminum baseplate, and a silver plating on the nickel plating. The nickel is plated on the aluminum baseplate before the aluminum has oxidized to provide high yields of stable crystals.
    Type: Grant
    Filed: April 4, 1983
    Date of Patent: October 23, 1984
    Assignee: General Electric Company
    Inventors: Robert J. Crescenzi, John U. Daniels, Jr., Gerald E. Roberts