Remote telephone extension system

Claim 1

APPARATUS ADAPTED TO PICK UP THE INCOMING RINGING, VOICE AND DIAL-TONE SIGNALS TO A CALLED TELEPHONE AND TO TRANSMIT TO THE CALLING TELEPHONE THE ANSWERING VOICE SIGNAL FROM A REMOTELY LOCATED PORTABLE RADIO-FREQUENCY ANSWERING STATION, SAID APPARATUS COMPRISING; A PORTABLE RADIO-FREQUENCY ANSWERING STATION INCLUDING A FIRST RECEIVER AND A FIRST TRANSMITTER, A FIXED RATIO-FREQUENCY STATION ASSOCIATED WITH SAID TELEPHONE INCLUDING A SECOND TRANSMITTER PROVIDED TO TRANSMIT SAID INCOMING RINGING AND VOICE SIGNALS FOR RECEPTION BY SAID FIRST RECEIVER, AND A SECOND RECEIVER FOR RECEIVING AND SUPPLYING TO AN OUTPUT LINE THE ANSWERING VOICE SIGNALS TRANSMITTED BY SAID FIRST TRANSMITTER, FIRST CIRCUIT MEANS RESPONSIVE TO THE ANSWERING VOICE SIGNAL FROM SAID SECOND RECEIVER PROVIDED TO OPERATIVELY PLACE A RESISTIVE TERMINATION ACROSS THE CALLED TELEPHONE LINE AND TO ELECTRICALLY COUPLE SAID OUTPUT LINE THERETO. AND SECOND CIRCUIT MEANS, OPERATIVELY RESPONSIVE TO THE TRANSIENT RESULTING FROM THE APPLICATION OF A DIALTONE SIGNAL TO THE CALLED TELEPHONE LINE FOR REMOVING THE RESISTIVE TERMINATION THEREFROM AND FOR UNCOUPLING FROM SAID LINE THE OUTPUT LINE FOR SUPPLYING THE ANSWERING VOICE SIGNALS FROM SAID SECOND RECEIVER.