Patents by Inventor David R. Grindel

David R. Grindel 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).

  • Input controller circuit apparatus for phase lock loop voltage controlled oscillator
    Patent number: 4570130
    Abstract: A phase lock loop oscillator is provided with a voltage controlled oscillator which includes a current controlled oscillator and an input controller therefor that maintains the center frequency of the current controlled oscillator substantially constant irrespective of changes in the gain of the voltage controlled oscillator.
    Type: Grant
    Filed: October 20, 1982
    Date of Patent: February 11, 1986
    Assignee: International Business Machines Corporation
    Inventors: David R. Grindel, Gary A. Trudgen