Patents by Inventor John W. Frew

John W. Frew 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).

  • High resolution and high accuracy time interval generator
    Patent number: 4516861
    Abstract: A presettable counter and a substantially identical counter both slaved to a crystal-controlled clock oscillator form a programmable slip counter for providing transition signals with a time interval therebetween in accordance with a coarse delay signal preset into the presettable counter. A programmable logic delay line responsive to a fine delay signal delays one of the transitions so as to impart a precise delay interval between the delayed transition signal and the other transition signal.
    Type: Grant
    Filed: October 7, 1983
    Date of Patent: May 14, 1985
    Assignee: Sperry Corporation
    Inventors: John W. Frew, Kenneth W. Robbins