US PATENT SUBCLASS 110 / 254
.~ With air preheater

Current as of: June, 1999
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110 /   HD   FURNACES

235  DF  REFUSE INCINERATOR {17}
254.~ With air preheater

DEFINITION

Classification: 110/254

With air preheater:

(under subclass 235) Apparatus including means to raise the temperature of air being delivered to the combustion chamber.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

302, for a furnace for burning solid fuel other than refuse provided with a noncombustible fluid preheater.