Patents by Inventor David Edward Penna

David Edward Penna 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).

  • Acoustic surface wave devices
    Patent number: 4023124
    Abstract: A length weighted interdigital transducer has .lambda./2 spaced electrodes within the overlap region. Outside the overlap region, the overlapping .lambda./2 spaced electrodes are connected to the bus bars by pairs of .lambda./4 spaced electrodes and extra "dummy" pairs of .lambda./4 spaced electrodes are also connected to the bus bars. The .lambda./2 spaced electrodes give a good manufacturing yield, and the .lambda./4 spaced pairs of electrodes and pairs of dummy electrodes provide compensation for wavefront distortion combined with low "interactions.
    Type: Grant
    Filed: July 29, 1975
    Date of Patent: May 10, 1977
    Assignee: U.S. Philips Corporation
    Inventors: David William Parker, David Edward Penna, Frederick Warren Smith, Richard Stevens