Double pulse recognition circuit

Claim 1

IN A CIRCUIT FOR PREVENTING SIGNALS FROM A CHARGED PARTICLE SENSITIVE APPARATUS FROM BEING RECEIVED BY AN ASSOCIATED PARTICLE REGISTERING DEVICE WHEN SUCCESSIVE CHARGED PATICLES ENTER SAID APPARATUS WITHIN A TIME INTERVAL LESS TAHN THAT REQUIRED FOR SAID REGISTERING DEVICE TO DISTINGUISH BETWEEN SAID SUCCESSIVE PARTICLES, THE COMBINATION COMPRISING A NORMALLY CLOSED GATING MEANS FOR TRANSMITTING SIGNAL FROM SAID APPARATUS TO SAID REGISTERING DEVICE, A FIRST AND SECOND CHARGED PARTICLE DETECTOR DISPOSED IN THE PATH OF PARTICLES ENTERING SAID APPARATUS AND PRODUCING SEPARATE OUTPUT PULSES IN RESPONSE TO SAID PARTICLES, A FIRST AND SECOND PULSE STRETECHER RECEIVING SAID OUTPUT PULSES FROM SAID FIRST AND SECOND DETECTORS RESPECTIVELY AND PRODUCING STRETCHED PULSES OF UNIFORM DURATION FROM SAID OUTPUT PULSES, A COINCIDENCE CIRCUIT HAVING A PAIR OF PULSE INPUT MEANS EACH RECEIVING SAID STRETCHED PULSES FROM A SEPARATE ONE OF SAID PULSE STRETCHERS AND PRODUCING AN OUTPUT SIGNAL UPON THE RECEIPT OF CONCURRENT INPUT SIGNALS, SAID COINCIDENCE CIRCUIT BEING OF THE CLASS PRODUCING AN OUTPUT SIGNAL HAVING AN AMPLITUDE PROPORTION TO THAT OF THE SMALLEST OF SAID CONCURRENT INPUT SIGNALS, AND AN AMPLITUDE DETECTING MEANS COUPLED BETWEEN SAID COINCIDENCE CIRCUIT AND SAID GATING MEANS FOR TEMPORARILY OPENING SAID GATING MEANS WHEN THE AMPLITUDE OF THE OUTPUT SIGNAL FROM SAID COINCIDENCE CIRCUIT EXCEEDS THE AMPLITUDE LEVEL RESULTING FROM ACTIVATION OF SAID CHARGED PARTICLE DETECTORS BY A SINGLE ONE OF SAID CHARGED PARTICLES.