Patents by Inventor John P. Keal

John P. Keal 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).

  • Secure communication system for multiple remote units
    Patent number: 4829540
    Abstract: A frequency-hopping datalink and providing communication between a base station, relay unit and multiple remote units utilizes time-division multiplexing and transmits information signals containing information relevant to the next frequencies of transmission. Signals from the base station are transmitted on a first frequency to a relay unit which retransmits the signals on a second frequency to a group of remote units. The information signal from the base station contains information concerning the frequencies of the next transmission and the time slot allotted for the remote units to respond. The remote units respond back at the first frequency which is received by the relay unit and rebroadcast to the base station at the second frequency.
    Type: Grant
    Filed: October 29, 1987
    Date of Patent: May 9, 1989
    Assignee: Fairchild Weston Systems, Inc.
    Inventors: William N. Waggener, Sr., John P. Keal