Control circuit producing output signal so long as input pulses occur within certaintime interval

Claim 1

A CIRCUIT FOR PRODUCING A CONTINUOUS CONTROL SIGNAL IN RESPONSE TO INPUT SIGNALS WHICH RECUR WITHIN SOME INTERVAL COMPRISING AN INPUT CIRCUIT, MEANS FOR APPLYING SAID INPUT SIGNALS TO SAID INPUT CIRCUIT, AN OSCILLATOR COMPRISING A UNIJUNCTION TRANSISTOR AND A CAPACITOR COUPLED TOGETHER SO THAT SAID UNIJUNCTION TRANSISTOR CONDUCTS IN RESPONSE TO A PREDETERMINED CHARGE ON SAID CAPACITOR AND DISCHARGES SAID CAPACITOR, SAID OSCILLATOR PRODUCING SIGNALS IN THE ABSENCE OF INPUT SIGNALS APPLIED THERETO WHICH RECUR WITHIN SAID INTERVAL AND PRODUCING NO SIGNALS IN THE PRESENCE OF INPUT SIGNALS APPLIED THERETO WHICH RECUR WITHIN SAID INTERVAL, MEANS COUPLING SAID INPUT CIRCUIT TO SAID OSCILLATOR FOR APPLYING SAID INPUT SIGNALS THERETO, A BISTABLE CIRCUIT HAVING FIRST AND SECOND TRANSISTORS COUPLED TOGETHER SO THAT SIGNALS APPLIED TO SAID FIRST TRANSISTOR ARE REINFORCED BY SAID SECOND TRANSISTOR, MEANS COUPLING SAID OSCILLATOR TO SAID BISTABLE CIRCUIT FOR APPLYING SAID OSCILLATOR SIGNALS THERETO, AND MEANS COUING SAID INPUT SIGNALS THERETO, SAID BISTABLE CIRCUIT ASSUMPLING SAID INPUT CIRCUIT TO SAID BISTABLE CIRCUIT FOR APPLYING A FIRST CONDITION IN RESPONSE TO SAID OSCILLATOR SIGNALS AND ASSUMING A SECOND CONDITION IN RESPONSE TO SAID INPUT SIGNALS, AND SAID BISTABLE CIRCUIT PRODUCING SAID CONTINUOUS CONTROL SIGNAL IN RESPONSE TO SAID SECOND CONDITION.