Mobile radio with timing circuit for automatically energizing the transmitter upon receipt of a call

Claim 1

IN A SELECTIVE CALLING SYSTEM FOR INTERCOMMUNICATION BETWEEN A CENTRAL STATION AND A REMOTE STATION, THE COMBINATION COMPRISING: A NORMALLY INACTIVE TRANSMITTER LOCATED AT SAID REMOTE STATION, A NORMALLY ENERGIZED RECEIVER LOCATED AT SAID REMOTE STATION, A POWER SOURCE, MEANS CONNECTING SAID POWER SOURCE TO SAID RECEIVER, AN ALARM ENERGIZED IN RESPONSE TO THE RECEPTION OF AN IDENTIFYING SIGNAL AT SAID RECEIVER, A TIMING CIRCUIT SIMULTANEOUSLY ENERGIZED UPON RECEPTION OF THE INDENTIFYING SIGNAL AT SAID RECIEVER, AND A TRANSMITTER CONTROL CIRCUIT, MEANS RESPONSIVE TO THE ENERGIZATION OF SAID TIMING CIRCUIT FOR ACTUATING SAID CONTROL CIRCUIT AND CONNECTING THE TRANSMITTER TO THE POWER SOURCE AND MAINTAINING THE TRANSMITTER ENERGIZED FOR A PREDETERMINED PERIOD OF TIME AFTER SAID IDENTIFYING SIGNAL IS NO LONGER RECEIVED TO CONDITION THE TRANSMITTER FOR TRANSMISSION DURING SAID PREDETERMINED PERIOD OF TIME, AND OPERATOR CONTROLLED MANUAL MEANS FOR CONNECTING SAID SOURCE TO SAID CONTROL CIRCUIT UPON RESPONSE OF THE OPERATOR TO CALL.