Noise eliminating gate circuit

Claim 1

AN ELECTRONIC GATE CIRCUIT OPERABLE BY AN OPERATING SIGNAL IN THE PRESENCE OF UNDESIRED RANDOM SIGNALS OF LESSER AMPLITUDE THAN THE OPERATING SIGNAL, COMPRISING AN INPUT RELAY HAVING A CATHODE, ANODE AND CONTROL ELECTRODE, AN OUTPUT RELAY HAVING A CATHODE, ANODE AND CONTROL ELECTRODE AND A BIAS CONTROL RELAY HAVING AN ANODE, CATHODE AND CONTROL ELECTRODE FOR CONTROLLING THE BIAS ON THE CATHODE ELECTRODE OF THE OUTPUT RELAY, SAID CONTROL RELAY HAVING ITS INPUT CONNECTED TO RECEIVE THE OUTPUT FROM THE INPUT RELAY AND HAVING A RESISTOR IN ITS OUTPUT CIRCUIT INCLUDED IN THE CATHODE ELECTRODE CIRCUIT OF SAID OUTPUT RELAY TO CONTROL THE BIAS ON THE LAST-MENTIONED CATHODE ELECTRODE, A SECOND RESISTOR IN THE CIRCUIT OF THE OUTPUT RELAY CONTROL ELECTRODE, A CHARGING CONDENSER SHUNTING SAID SECOND RESISTOR, AND MEANS FOR CHARGING SAID CONDENSER FROM THE OUTPUT OF SAID INPUT RELAY BY THE VOLTAGE OF THE RANDOM SIGNALS OR NOISE AT THE OUTPUT OF SAID INPUT RELAY, WHEREBY THE BIAS ON SAID OUTPUT RELAY CONTROL ELECTRODE IS CONTROLLED BY SAID SECOND RESISTOR WITH A DELAY DETERMINED BY THE TIME CONSTANT OF SAID SECOND RESISTOR AND SAID CONDENSER, THE BIAS ON THE CONTROL ELECTRODE OF THE CONTROL TUBE BEING BEYOND CUTOFF IN THE ABSENCE OF OPERATING SIGNAL.