Controlled rectifier inverter circuit

Claim 1

AN INVERTER CIRCUIT COMPRISING: A PAIR OF CONTROLLED RECTIFIERS; A PAIR OF DIRECT CURRENT INPUT TERMINALS; A CAPACITOR CONNECTED IN CIRCUIT WITH SAID INPUT TERMINALS; A PAIR OF OUTPUT TERMINALS FOR CONNECTION WITH A LOAD CIRCUIT HAVING A RESISTANCE AND AN INDUCTANCE; CIRCUIT MEANS CONNECTING SAID INPUT TERMINALS WITH SAID CONTROLLED RECTIFIERS TO PROVIDE A CURRENT FLOW IN ONE DIRECTION DURING ONE HALF CYCLE AND IN AN OPPOSITE DIRECTION DURING THE OTHER HALF CYCLE AT SAID OUTPUT TERMINALS, SAID CAPACITOR BEING CHARGED AND DISCHARGED DURING EACH CYCLE; A FIRST AND SECOND FIRING CIRCUIT, EACH HAVING A PAIR OF FIRING CAPACITORS, A RESISTOR AND A REACTOR, EACH OF SAID REACTORS AND ONE OF SAID FIRING CAPACITORS BEING ASSOCIATED IN TUNED CIRCUIT RELATIONSHIP AND ONE OF SAID REACTORS COUPLING SAID FIRING CIRCUIT WITH ONE OF SAID CONTROLLED RECTIFIER AND THE OTHER OF SAID REACTORS COUPLING SAID FIRING CIRCUIT WITH THE OTHER OF SAID CONTROLLED RECTIFIERS; A CURRENT SENSING TRANSFORMER HAVING A PRIMARY AND A SECONDARY, SAID PRIMARY BEING CONNECTED IN SERIES CIRCUIT RELATIONSHIP WITH SAID OUTPUT TERMINALS AND SAID SECONDARY BEING CONNECTED IN CIRCUIT WITH SAID FIRING CIRCUIT TO ALTERNATELY SUPPLY A CHARGING CURRENT TO ONE OF SAID PAIRS OF FIRING CAPACITORS IN RESPONSE TO THE CURRENT REVERSALS ACROSS SAID PRIMARY, SAID FIRING CIRCUIT PROVIDING A DELAYED CURRENT PULSE TO THE PREVIOUSLY NONCONDUCTING ONE OF SAID CONTROLLED RECTIFIERS TO TRIGGER IT AT THE END OF A PREDETERMINED DELAY AFTER THE OTHER CONTROLLED RECTIFIER HAS BEEN TURNED OFF.