Selective paging system

Claim 1

A RADIO PAGING SYSTEM EMPLOYING A SELECTIVE PULSE POSITION MODULATION CODING ARRANGEMENT, SAID CODING ARRANGEMENT COMPRISING A PLURALITY OF PULSE PAIRS HAVING DISTINCT PREDETERMINED TIME SEPARATIONS BETWEEN THE PULSES OF EACH PAIR AND WITH GIVEN TIME INTERVALS BETWEEN SUCCESSIVE PAIRS, MEANS FOR SUCCESSIVELY RECEIVING SAID PLURALITY OF PULSE PAIRS, AN INPUT CIRCUIT COUPLED TO SAID RECEIVING MEANS, A PULSE TRANSFORMER HAVING THE PRIMARY WINDING COUPLED TO SAID INPUT CIRCUIT AND HAVING A PLURALITY OF SECONDARY WINDINGS, TIMING MEANS CONNECTED TO SAID INPUT CIRCUIT INCLUDING A DELAY LINE HAVING A DELAY EQUAL TO THE TIME SEPARATION BETWEEN THE PULSES OF THE FIRST OF THE RECEIVED PULSE PAIRS, GATING MEANS CONNECTED TO ONE OF SAID SECONDARY WINDINGS AND TO THE OUTPUT OF SAID TIMING MEANS FOR PROVIDING AN ENERGIZING SIGNAL IN RESPONSE TO THE PRESENCE OF CONCURRENT PULSE SIGNALS AT THE SECONDARY WINDING AND THE OUTPUT OF SAID TIMING MEANS, HOLDING CIRCUIT MEANS CONNECTED TO SAID GATING MEANS AND OPERATIVE IN RESPONSE TO SAID ENERGIZING SIGNAL TO PROVIDE AN OUTPUT SIGNAL OF A DURATION CORRESPONDING TO THE TIME INTERVAL BETWEEN THE SECOND PULSE OF THE FIRST RECEIVED PULSE PAIR AND THE SECOND PULSE OF THE SECOND RECEIVED PULSE PAIR, A SECOND TIMING MEANS CONNECTED TO SAID INPUT CIRCUIT INCLUDING A DELAY LINE HAVING A DELAY EQUAL TO THE TIME SEPARATION BETWEEN THE PULSES OF THE SECOND OF THE RECEIVED PULSE PAIRS, SECOND GATING MEANS CONNECTED TO ANOTHER OF SAID SECONDARY WINDINGS AND TO THE OUTPUT CIRCUIT OF SAID SECOND TIMING MEANS FOR PROVIDING AN ENERGIZING SIGNAL IN RESPONSE TO THE PRESENCE OF CONCURRENT PULSE SIGNALS AT THE SECONDARY WINDING AND THE OUTPUT OF SAID SECOND TIMING MEANS, SECOND HOLDING CIRCUIT MEANS CONNECTED TO THE OUTPUT OF SAID SECOND GATING MEANS AND THE OUTPUT OF THE FIRST-MENTIONED HOLDING CIRCUIT MEANS AND OPERATIVE IN RESPONSE TO THE PRESENCE OF CONCURRENT SIGNALS AT THE OUTPUT OF SAID SECOND GATING MEANS AND THE OUTPUT OF SAID FIRST-MENTIONED HOLDING CIRCUIT MEANS TO PROVIDE AN OUTPUT SIGNAL OF A DURATION CORRESPONDING TO THE TIME INTERVAL BETWEEN THE SECOND PULSE OF THE SECOND RECEIVED PULSE PAIR AND THE SECOND PULSE OF THE THIRD RECEIVED PULSE PAIR, A THIRD TIMING MEANS CONNECTED TO SAID INPUT CIRCUIT INCLUDING A DELAY LINE HAVING A DELAY EQUAL TO THE TIME SEPARATION BETWEEN TH PULSES OF THE THIRD OF THE RECEIVED PULSE PAIRS, THIRD GATING MEANS CONNECTED TO STILL ANOTHER OF SAID SECONDARY WINDINGS AND TO THE OUTPUT OF SAID THIRD TIMING MEANS FOR PROVIDING AN ENERGIZING SIGNAL IN RESPONSE TO THE PRESENCE OF CONCURRENT PULSE SIGNALS AT THE SECONDARY WINDING AND THE OUTPUT OF SAID THIRD TIMING MEANS, SIGNALING MEANS, AND CIRCUIT MEANS CONNECTED TO THE OUTPUT OF SAID THIRD GATING MEANS AND TO THE OUTPUT OF SAID SECOND HOLDING CIRCUIT MEANS FOR DELIVERING AN ACTUATING SIGNAL TO SAID SIGNALING MEANS IN RESPONSE TO THE PRESENCE OF CONCURRENT SIGNALS AT THE OUTPUT OF SAID THIRD GATING MEANS AND THE OUTPUT OF SAID SECOND HOLDING CIRCUIT MEANS.