(under the class definition) Device having means to elevate the temperature of a gas or vapor supplied to a treating vessel prior to the entry of the gas into the treating zone.
SEE OR SEARCH CLASS
165, Heat Exchange, appropriate subclass, for a heat exchange, per se, particularly
4+, for a regeneration-type heat exchanger.
432, Heating,
40, for the automatic control of a hot blast stove; subclasses 78+, wherein combustion feed air cools existing work by contact; subclass 84, wherein combustion feed air cools the furnace wall; subclasses 179+, wherein the furnace exhaust heats the furnace feed air; subclasses 214+, for a hot blast stove, per se, and subclasses 219+, for a residual gas heater, per se.
