US PATENT SUBCLASS 110 / 302
.~.~ Preheater

Current as of: June, 1999
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110 /   HD   FURNACES

297  DF  INCLUDING NONCOMBUSTIBLE FLUID SUPPLY MEANS {3}
301  DF  .~ Having treatment means {2}
302.~.~ Preheater {5}
303  DF  .~.~.~> And furnace gas mixer
304  DF  .~.~.~> Remote from combustion chamber
305  DF  .~.~.~> Bridgewall
306  DF  .~.~.~> Water or steam {1}
308  DF  .~.~.~> Internal to or attachable to wall

DEFINITION

Classification: 110/302

Preheater:

(under subclass 301) Apparatus wherein the modifying means increases the temperature of the fluid prior to entering the combustion chamber.

SEE OR SEARCH THIS CLASS, SUBCLASS:

201, for a locomotive-type furnace provided with a preheater.

SEE OR SEARCH CLASS

126, Stoves and Furnaces,

15, for a culinary heating apparatus provided with a preheater, subclass 58 for a heating stove provided with a preheater, and subclass 112 for a hot air furnace provided with a preheater.

266, Metallurgical Apparatus, 138+, for a metallurgical apparatus provided with means to preheat a gas or vapor supplied to the apparatus.

432, Heating,

78+, for a heating apparatus provided with means to heat incoming air.