Threshold trigger having regenerative feedback but maintaining conduction only during presence of input signal

Claim 1

A THRESHOLD TRIGGER CIRCUIT COMPRISING A PAIR OF TRANSISTORS OF OPPOSITE CONDUCTIVITY TYPES CONNECTED IN CIRCUIT WITH A POTENTIAL SOURCE TO NORMALLY APPLY CUT OFF BIAS POTENTIALS TO ELECTRODES OF BOTH TRANSISTORS, COUPLING MEANS FROM ONE TRANSISTOR TO THE OTHER TRANSISTOR EFFECTIVE UPON CONDUCTION OF SAID ONE TRANSISTOR FOR APPLYING POTENTIALS OPPOSING THE BIAS POTENTIALS ON THE ELECTRODES OF SAID OTHER TRANSISTOR, MEANS FOR APPLYING A SIGNAL TO THE BASE OF SAID ONE TRANSISTOR FOR INITIATING CONDUCTION OF SAID OTHER TRANSISTOR, AND A REGENERATIVE FEEDBACK CIRCUIT BETWEEN CORRESPONDING ELECTRODES OF SAID TRANSISTORS EFFECTIVE UPON CONDUCTION OF SAID OTHER TRANSISTOR FOR APPLYING POTENTIALS OPPOSING THE BIAS POTENTIALS ON THE ELECTRODES OF SAID ONE TRANSISTOR BUT INSUFFICIENT TO RENDER SAID ONE TRANSISTOR CONDUCTIVE IN THE ABSENCE OF A SIGNAL APPLIED TO THE BASE THEREOF.