Patents by Inventor William S. Duncan

William S. Duncan 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).

  • Oscillator with crystal-resistive feedback
    Patent number: 4560956
    Abstract: A standard TTL inverter (1) drives a series circuit of an inductor (9) and a capacitor (11). This is fed back through a frequency-control crystal (15). A resistor (19) is also in the feedback circuit, and a resistor 7 bridges the low-current-accepting inverter (1). None of the circuit elements need be of high precision or otherwise expensive.
    Type: Grant
    Filed: September 26, 1983
    Date of Patent: December 24, 1985
    Assignee: International Business Machines Corporation
    Inventor: William S. Duncan