Gas-fired infrared burners and heaters

Claim 1

AN INFRARED GENERATOR OF THE COMBUSTION TYPE COMPRISING: (A) AN APERTURED PRIMARY RADIANT MEMBER OF THIN, HEAT RESISTANT METAL PLATE OPERATING AT INCANDESCENT TEMPERATURES; (B) MEANS FOR FORCING A MIXTURE OF COMBUSTIBLE GAS AND ALL OF THE AIR REQUIRED FOR ITS COMPLETE COMBUSTION FROM ONE SIDE OF SAID PRIMARY RADIANT MEMBER THROUGH THE APERTURES THEREIN TO A COMBUSTION ZONE IMMEDIATELY ADJACENT THE EXTERIOR SURFACE OF SAID PRIMARY RADIANT MEMBER; AND (C) AN APERTURED RERADIATING MEMBER OF THIN, HEAT RESISTANT METAL PLATE SIMILAR TO THAT FROM WHICH THE PRIMARY RADIANT IS FABRICATED OPERATING AT INCANDESCENT TEMPERATURES AND SURROUNDING SAID RADIANT MEMBER BEYOND THE COMBUSTION ZONE THEREADJACENT, WHEREBY SAID COMBUSTION ZONE IS CONFINED WITHIN SAID PRIMARY AND RERADIATING MEMBERS; (D) THE PRIMARY RADIANT MEMBER BEING A TRUNCATED CONE WITH THE SMALL END THEREOF EXTENDING INTO THE RADIANT MEMBER; (E) THE APERTURES IN THE PRIMARY RADIANT MEMBER BEING SUFFICIENTLY SMALL TO PREVENT FLASHBACK FROM THE COMBUSTION ZONE THROUGH SAID MEMBER TO THE COMBUSTIBLE MIXTURE ON SAID ONE SIDE THEREOF WITH SAID MEMBER AT A TEMPERATURE ABOVE THE IGNITION TEMPERATURE OF THE COMBUSTIBLE GAS-AIR MIXTURE; AND (F) THE AGGREGATE AREA OF THE APERTURES IN THE RERADIATING MEMBER BEING AT LEAST TWICE AND NOT MORE THAN TEN TIMES AS GREAT AS THE AGGREGATE AREA OF THE APERTURES IN THE PRIMARY RADIANT MEMBER.