Patents Assigned to Datatrak Limited
  • Mobile transmitter/receiver
    Patent number: 4907290
    Abstract: A mobile transmitter/receiver is for use in a communication system comprising a plurality of fixed transmitters/receivers located at spaced apart positions in a terrestial area, each fixed transmitter/receiver operating on one or more of a plurality of radio frequency channels.
    Type: Grant
    Filed: May 13, 1988
    Date of Patent: March 6, 1990
    Assignee: Datatrak Limited
    Inventor: Edward W. Crompton