×

Nationwide communication system

  • US 5,634,198 A
  • Filed: 02/13/1995
  • Issued: 05/27/1997
  • Est. Priority Date: 11/12/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A mobile transceiver unit for transmitting messages to and receiving messages from a network comprising:

  • input means for allowing a user to input a user message to the unit;

    transmitter means for transmitting a radio frequency signal including the user message from the mobile unit to the network;

    receiver means for receiving radio frequency signals having a message from the network;

    signal detector means for detecting a noise signal at approximately 400 Hz generated by an aircraft;

    means for determining whether the detected noise signal exceeds a predetermined threshold; and

    a circuit for disabling the transmitter means upon the determining means determining that the detected noise signal exceeds the predetermined threshold, thereby preventing unwanted radio frequency transmission.

View all claims
  • 10 Assignments
Timeline View
Assignment View
    ×
    ×