Patents by Inventor James C. Kirby

James C. Kirby 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).

  • Null seeking position sensor
    Patent number: 5015998
    Abstract: A position sensor includes of two primary sense windings for establishing a forward or drive field, two secondary sense windings in which a voltage may be induced in the presence of the drive field, and at least one conductive screen capable of blocking the magnetic coupling between the primary and secondary sense windings. When the screen blocks the magnetic coupling between one pair of sense windings to the same extent that ti does between the other pair of sense windings, the sensor circuitry generates a marker signal to indicate the position of the screen.
    Type: Grant
    Filed: August 9, 1989
    Date of Patent: May 14, 1991
    Assignee: Kollmorgen Corporation
    Inventors: George H. Ellis, James C. Kirby