Transistor inverter circuit being switched before output transformer saturates

Claim 1

IN AN INVERTER CIRCUIT HAVING A PAIR OF TRANSISTORS CONNECTED IN SERIES OPPOSITION ACROSS A PRIMARY WINDING OF THE OUTPUT TRANSFORMER, WITH A SECONDARY WINDING FOR THE LOAD AND WITH THE D.C. SUPPLY CONNECTED TO THE JUNCTION POINT OF THE TRANSISTORS AND TO THE CENTER TAP OF THE PRIMARY WINDINGS, THE IMPROVEMENT COMPRISING IN COMBINATION: A DRIVE CIRCUIT CONNECTED TO SAID TRANSISTORS IN DRIVING RELATION FOR SEQUENTIALLY TURNING SAID TRANSISTORS ON AND OFF IN SYNCHRONISM AND OUT OF PHASE WITH EACH OTHER, SAID DRIVE CIRCUIT PRODUCING A DRIVE CURRENT SUBSTANTIALLY IN THE FORM OF A SQUARE WAVE WITH A ZERO CURRENT PERIOD BETWEEN EACH POSITIVE AND NEGATIVE PORTION OF THE WAVE, WITH THE DRIVE CURRENT TURNING A TRANSISTOR OFF PRIOR TO SATURATION OF THE CORE OF THE OUTPUT TRANSFORMER; CAPACITOR MEANS CONNECTED ACROSS SAID PRIMARY WINDING OF THE TRANSFORMER; AND MEANS CONNECTED IN THE LOAD SIDE OF SAID TRANSFORMER FOR DELAYING THE APPLICATION OF LOAD TO THE SECONDARY WINDING UNTIL THE SECONDARY VOLTAGE RISES TO SUBSTANTIALLY PEAK VALUE FOLLOWING POLARITY REVERSAL.