Patents by Inventor Robert T. Forrest

Robert T. Forrest 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).

  • Multichannel radio telephone system
    Patent number: 4281413
    Abstract: Phantom signals resulting from intermodulation between a busy channel and an idle channel with idle tone cause scanning radio stations to lock on a phantom idle channel and miss communications. Locking on a phantom idle channel is prevented by transmitting a busy tone on each channel having communication so that any phantom signals resulting from intermodulation will include busy tone. A scanning station is arranged to lock on a channel with only idle tone, and not lock on any channel (real or phantom) with busy tone.
    Type: Grant
    Filed: December 3, 1979
    Date of Patent: July 28, 1981
    Assignee: General Electric Company
    Inventor: Robert T. Forrest