Patents by Inventor F. Douglas Shields

F. Douglas Shields 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).

  • Piezoelectric panel speaker
    Patent number: 5196755
    Abstract: An acoustic transducer system includes a plurality of individual transflexural piezoelectric elements potted in a plastic or rubber compound. The panel is able to radiate broad-band, high intensity sound waves in a controllable radiation pattern.
    Type: Grant
    Filed: April 27, 1992
    Date of Patent: March 23, 1993
    Inventor: F. Douglas Shields