Patents by Inventor Robert Joy

Robert Joy 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).

  • Publication number: 20070115175
    Abstract: A handheld GPS jammer locator for locating a GPS jamming signal generated by a jammer. The handheld GPS jammer locator has two modes of operation, a amplitude mode and a difference finding mode. The amplitude measures the strength of an incoming GPS jamming signal and the difference finding mode determines the direction of the incoming jamming signal.
    Type: Application
    Filed: November 22, 2005
    Publication date: May 24, 2007
    Inventors: Gregory Velicer, Robert Joy
  • Patent number: 4496886
    Abstract: A three state driver for an inductive load, e.g., a stator winding of a variable reluctance motor, allows the use of charge, idle, and discharge states in which a positive voltage, a short, and a reverse voltage are connected across the inductive load, respectively. An H-bridge comprising two electronic switches and two diodes is used to switch the inductive load voltages as commanded by a comparator circuit which compares the load current to a desired load current.
    Type: Grant
    Filed: November 8, 1982
    Date of Patent: January 29, 1985
    Assignee: Hewlett-Packard Company
    Inventors: Gary B. Gordon, Robert Joy, Michael J. Lee