Time controlled switch using saturable core input

Claim 1

A CONTROLLABLE SWITCHING CIRCUIT FOR A LOAD COMPRISING A SWITCHING DEVICE HAVING THREE ELECTRODES AND BEING CAPABLE OF PASSING CURRENT FROM A FIRST TO A SECOND OF SAID ELECTRODES ONLY WHEN THE THIRD ELECTRODE RECEIVES A PREDETERMINED INPUT SIGNAL, A LOAD CONNECTED TO SAID SECOND ELECTRODE THEREBY FORMING A SERIES COMBINATION INCLUDING SAID SWITCHING DEVICE AND LOAD, A VOLTAGE SOURCE FOR PRODUCING SAID CURRENT, MEANS FOR COUPLING SAID SOURCE ACROSS SAID SERIES COMBINATION, A TRANSFORMER HAVING PRIMARY AND SECONDARY WINDINGS, SAID SECONDARY WINDING BEING COUPLED BETWEEN SAID FIRST AND THIRD ELECTRODES, MEANS FOR MAKING SAID SWITCHING DEVICE NORMALLY NON-CONDUCTIVE OF SAID CURRENT, MEANS INCLUDING A CONDENSER IN SERIES WITH SAID PRIMARY WINDING FOR COUPLING THE PRIMARY WINDING ACROSS SAID VOLTAGE SOURCE, AND SWITCHING MEANS COUPLED ACROSS SAID PRIMARY WINDING AND CONDENSER, THE ARRANGEMENT BEING SUCH THAT WHEN SAID SWITCHING MEANS IS OPEN, SAID CONDENSER IS CHARGED BY THE VOLTAGE SOURCE CURRENT FLOWING IN A FIRST DIRECTION THROUGH SAID PRIMARY WINDING SO AS TO CAUSE SAID SWITCHING DEVICE TO BE MAINTAINED NONCONDUCTIVE, WHILE WHEN SAID SWITCHING MEANS IS CLOSED, SAID CONDENSER IS DISCHARGED THROUGH THE PRIMARY WINDING CAUSING A CURRENT THEREIN IN A DIRECTION OPPOSITE TO SAID FIRST DIRECTION AND THEREBY EFFECTING SAID PREDETERMINED INPUT SIGNAL TO THE SWITCHING DEVICE SO AS TO ALLOW CURRENT FROM THE VOLTAGE SOURCE TO PASS THROUGH SAID FIRST AND SECOND ELECTRODES TO SAID LOAD, SAID SWITCHING MEANS BEING OPERATIVE AFTER A PREDETERMINED TIME TO STOP THE DISCHARGING OF SAID CONDENSER AND ALLOW IT TO BE RECHARGED THEREBY ENDING SAID PREDETERMINED INPUT SIGNAL AND CAUSING THE CURRENT TO SAID LOAD TO CEASE.