Patents by Inventor Loi Q. Ninh

Loi Q. Ninh 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).

  • Method for tuning piezoelectric resonators
    Patent number: 4454639
    Abstract: A method for adjusting the frequency of a piezoelectic resonator such as a quartz crystal is disclosed. The resonator is placed within its enclosure facing a metallic surface. The atmosphere within the enclosure is made suitable for supporting a glow discharge. An electrical potential is then established between the resonator electrode and the metallic surface causing mass to sputter between the electrode and to the metallic surface to vary the characteristics of the resonator.
    Type: Grant
    Filed: June 3, 1982
    Date of Patent: June 19, 1984
    Assignee: Motorola, Inc.
    Inventors: Lawrence N. Dworsky, Douglas H. Weisman, Loi Q. Ninh