Sudden expansion burner having step fuel injection

Claim 1

A SUDDEN EXPANSION BURNER COMPRISING: A SMALL PIPE SECTION CONNECTED WITH A SUPPLY OF OXIDANT; A LARGER PIPE SECTION DOWNSTREAM OF THE SMALL PIPE SECTION; A STEP MEMBER EXTENDING ONLY OUTWARDLY AT THE END OF SAID SMALL PIPE SECTION CONNECTING THE END OF SAID SMALL PIPE SECTION WITH THE ADJACENT END OF THE LARGER PIPE SECTION; TWO FUEL MANIFOLDS; A PLURALITY OF NOZZLES SUPPORTED ADJACENT SAID STEP MEMBER FOR CONTINUOUSLY DIRECTING FUEL INTO THE OXIDANT EMERGING FROM SAID SMALLER PIPE SECTION AND OVER THE SURFACE OF THE STEP MEMBER; MEANS FOR CONNECTING EACH OF SAID NOZZLES TO ONE OR THE OTHER OF SAID MANIFOLDS, THE NOZZLES CONNECTED TO EACH MANIFOLD BEING ARRANGED IN A CIRCULAR PATTERN, ONE CIRCULAR PATTERN BEING OF GREATER DIAMETER THAN THE OTHER AND HAVING A GREATER NUMBER OF NOZZLES; AND MEANS SUPPORTED ADJACENT SAID STEP MEMBER FOR IGNITING THE FUEL WITH THE OXIDANT AT A LOCATION DOWNSTREAM OF SAID STEP MEMBER.