Patents by Inventor David J. Cooley

David J. Cooley 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 servomotor drive apparatus
    Patent number: 4383245
    Abstract: An apparatus for converting digital signals into analog pulse width modulated signals without a D/A Converter includes an up-down counter, programmed by the digital signal, which provides a signal to logic circuitry at the conclusion of each count. The logic circuitry responds to the counter signal and clock signals coupled thereto to provide an analog pulse width modulated signal corresponding to the digital signal.
    Type: Grant
    Filed: October 31, 1980
    Date of Patent: May 10, 1983
    Assignee: Sperry Corporation
    Inventors: David J. Cooley, Theodore C. Ebbinga