Regenerative furnaces

Claim 1

A REGENERATIVE FURNACE COMPRISING: A FURNACE CHAMBER HAVING OPPOSED SIDE WALLS, END WALLS AND A ROOF, SAID OPPOSED SIDE WALLS HAVING INLETS THEREIN FOR THE INTRODUCTION OF REGENERATIVELY PREHEATED GASEOUS OXYDANT INTO SAID CHAMBER, SAID CHAMBER HAVING A SINGLE OUTLET FOR COMBUSTION PRODUCTS SEPARATE FROM SAID INLETS; AN EXHAUST BLOWER HAVING AN INLET AND AN OUTLET; FLUID FUEL BURNER MEANS DISPOSED IN EACH OF SAID OXYDANT INLETS; MEANS FOR CONTINUOUSLY SUPPLYING FLUID FUEL TO ALL OF SAID BURNER MEANS; A SOURCE OF COLD GASEOUS OXYDANT; FIRST AND SECOND REGENERATORS FOR ALTERNATELY ABSORBING HEAT FROM HOT COMBUSTION PRODUCTS AND GIVING UP HEAT TO COLD GASEOUS OXYDANT, EACH OF SAID REGENERATORS HAVING A HOT END FOR RECEIVING COMBUSTION GASES FROM SID SINGLE OUTLET AND A COLD END FOR RECEIVING COLD GASEOUS OXYDANT FROM SAID SOURCE; FIRST REVERSING VALVE MEANS ASSOCIATED WITH THE COLD ENDS OF SAID REGENERATORS OPERATIVE IN A FIRST POSITION TO SIMULTANEOUSLY CONNECT THE COLD END OF THE FIRST REGENERATOR TO SAID SOURCE OF COLD OXYDANT AND THE COLD END OF THE SECOND REGENERATOR TO THE INLET OF SAID EXHAUST BLOWER AND OPERATIVE IN A SECOND POSITION TO SIMULTANEOUSLY CONNECT THE COLD END OF THE SECOND REGENERATOR TO SAID SOURCE AND THE COLD END OF SAID FIRST REGENERATOR TO THE INLET OF SAID EXHAUST BLOWER; SECOND REVERSING VALVE MEANS DOWNSTREAM OF SAID SINGLE OUTLET ASSOCIATED WITH THE HOT ENDS OF SAID REGENERATORS OPERATIVE IN A FIRST POSITION TO SIMULTANEOUSLY CONNECT THE HOT END OF THE FIRST REGENERATOR TO BOTH SAID OXYDANT INLETS AND THE HOT END OF THE SECOND REGENERATOR TO SAID SINGLE OUTLET AND OPERATIVE IN A SECOND POSITION TO SIMULTENEOUSLY CONNECT THE HOT END OF THE SECOND REGENERATOR TO BOTH AID OXYDANT INLETS AND THE HOT END OF THE FIRST REGENERATOR TO SAID SINGLE OUTLET.