Patents by Inventor Frederick Y. Ch

Frederick Y. Ch 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).

  • Time delay modulation and correction device
    Patent number: 5034793
    Abstract: An acoustic charge transport device (ACT) alters the intersection of an associated surface acoustic wave (SAW) electric potential with the static depletion potential and the input contact potential to correct the timing variations inherent in conventional ACT devices. The ACT device incorporates a pair of correcting electrodes secured to the ACT channel on either side of an input electrode. The electrodes vary the depth of the electric potential of the SAW which ensures sampling of the input signals at consistent times.
    Type: Grant
    Filed: March 5, 1990
    Date of Patent: July 23, 1991
    Assignee: Motorola, Inc.
    Inventors: Donald C. Malocha, Frederick M. Fliegel, Frederick Y. Ch