Patents by Inventor Adrian DeVries

Adrian DeVries 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).

  • Surface acoustic wave device employing reflectors
    Patent number: 4410823
    Abstract: Electric domain reversals are arranged in parallel arrays on a piezoelectric ceramic substrate to form strong reflectors of surface acoustic waves in devices such as filters, resonators and the like. The domains are prepared by a poling process involving the use of a selective electrode pattern to which a high DC voltage is applied at a temperature above ambient but below the Curie temperature of the substrate.
    Type: Grant
    Filed: November 13, 1981
    Date of Patent: October 18, 1983
    Assignee: Zenith Radio Corporation
    Inventors: Robert L. Miller, Adrian DeVries