Pulse lengthening circuit employing a semi-conductor controlled rectifier

Claim 1

A PULSE LENGTHENING CIRCUIT COMPRISING IN COMBINATION A DIRECT CURRENT SOURCE, POSITIVE AND NEGATIVE TERMINALS CONNECTED TO SAID DIRECT CURRENT SOURCE, A SOURCE OF POSITIVE PULSES, A SWITCHABLE RECTIFIER HAVING AN ANODE, A CATHODE AND A GATE, SAID SWITCHABLE RECTIFIER BEING SWITCHED ON BY A POSITIVE PULSE BETWEEN ITS GATE AND CATHODE, AND BEING SWITCHED OFF BY A NEGATIVE PULSE BETWEEN ITS GATE AND CATHODE, MEANS CONNECTING THE ANODE OF SAID SWITCHABLE RECTIFIER TO SAID POSITIVE TERMINAL, A DIODE HAVING ITS CATHODE CONNECTED TO THE GATE OF SAID SWITCHABLE RECTIFIER AND ITS ANODE CONNECTED TO SAID PULSE SOURCE, A LOAD CONNECTED BETWEEN THE CATHODE OF SAID SWITCHABLE RECTIFIER AND SAID NEGATIVE TERMINAL, AND AN INDUCTOR THROUGH WHICH THE GATE OF SAID SWITCHABLE RECTIFIER IS CONNECTED TO SAID NEGATIVE TERMINAL, SAID SWITCHABLE RECTIFIER BEING SWITCHED ON BY CURRENT FLOW BETWEEN ITS GATE AND CATHODE WHEN A POSITIVE PULSE IS RECEIVED FROM SAID PULSE SOURCE, SAID DIODE ISOLATING SAID GATE FROM SAID PULSE SOURCE WHEN SAID SWITCHABLE RECTIFIER CONDUCTS, AND SAID SWITCHABLE RECTIFIER BEING SWITCHED OFF BY CURRENT FLOW BETWEEN ITS GATE AND CATHODE FROM THE INDUCTOR AFTER THE SWITCHABLE RECTIFIER HAS BEEN CONDUCTING FOR A PREDETERMINED LENGTH OF TIME, A CAPACITOR THROUGH WHICH THE ANODE OF SAID DIODE IS CONNECTED TO SAID PULSE SOURCE, AND A RESISTOR THROUGH WHICH THE ANODE OF SAID DIODE IS CONNECTED TO SAID NEGATIVE TERMINAL, SAID CAPACITOR AND RESISTOR COOPERATING TO DIFFERENTIATE A PULSE FROM SAID SOURCE OF POSITIVE PULSES.