Patents by Inventor William C. Towle

William C. Towle 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).

  • Digital conference bridge
    Patent number: 3970797
    Abstract: A Digital/analog conference arrangement for up to M (15) digital subscribers. The digital signals are sensed, and up to N (3) are converted at the same time to analog signals which are processed in an analog bridge, then converted to digital signals which are transmitted to the appropriate subscribers. The voice signals of each subscriber are encoded by the continuously variable slope delta modulation (CVSD) technique into a serial digital bit stream, which are time-multiplexed into 15 input channels.
    Type: Grant
    Filed: January 13, 1975
    Date of Patent: July 20, 1976
    Assignee: GTE Sylvania Incorporated
    Inventors: David A. Johnson, William C. Towle