Energizing circuits for inductive loads

Claim 1

A CIRCUIT FOR SUPPLYING ENERGIZING PULSES OF SUBSTANTIALLY CONSTANT WIDTH TO A LOAD COMPRISING IN COMBINATION WITH SAID LOAD; A SOURCE OF DIRECT CURRENT SUPPLY VOLTAGE; A PRIMARY SWITCHING DEVICE OF THE MULTI-LAYER SEMICONDUCTOR TYPE HAVING A CATHODE, AN ANODE AND A GATE ELECTRODE; A NORMALLY-DISABLED ANODE-CATHODE PATH FOR SAID DEVICE CONNECTED IN SERIES WITH SAID LOAD ACROSS SAID SOURCE; A FIRST AND A SECOND TERMINAL CONNECTED TO SAID GATE ELECTRODE; TIMING MEANS HAVING A PREDETERMINED RC TIME CONSTANT, CONNECTED TO SAID PRIMARY DEVICE AND TO SAID SOURCE; MEANS FOR APPLYING TO SAID GATE ELECTRODE THROUGH SAID FIRST TERMINAL AT LEAST ONE STARTING POSITIVE PULSE OF SHORT DURATION TO CAUSE THE ENABLEMENT OF SAID ANODE-CATHODE CIRCUIT TO TURN ON SAID DEVICE SO THAT ENERGIZING POWER IS SUPPLIED THERETHROUGH TO SAID LOAD; AND MEANS IN SAID TIMING MEANS RESPONSIVE TO THE TURNING ON OF SAID PRIMARY DEVICE TO START THE TIMING ACTION IN SAID TIMING MEANS AND CAUSE IT TO SUPPLY AT THE END OF A PREDETERMINED TIME INTERVAL AFTER THE DEVICE HAS BEEN TURNED ON, A NEGATIVE STOP PULSE TO SAID GATE ELECTRODE THROUGH SAID SECOND TERMINAL DISABLING SAID ANODE-CATHODE PATH AND THUS CAUSING THAT DEVICE TO TURN OFF TO STOP THE FLOW OF ENERGIZING POWER TO SAID LOAD AND TO RETURN THE TIMING MEANS TO THE INITIAL UNOPERATED CONDITION; THE TIME FOR WHICH SAID LOAD IS ENERGIZED BETWEEN EACH STARTING AND STOPPING PULSE BEING DETERMINED BY THE TIME CONSTANT RC OF SAID TIMING MEANS.