US PATENT SUBCLASS 266 / 175
.~.~ With separate preheat chamber

Current as of: June, 1999
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266 /   HD   METALLURGICAL APPARATUS

168  DF  MEANS FOR TREATING ORES OR FOR EXTRACTING METALS {3}
171  DF  .~ By means applying heat to work, e.g., furnace {10}
175.~.~ With separate preheat chamber

DEFINITION

Classification: 266/175

(under subclass 171) Device wherein a distinct compartment or receptacle is provided within which the temperature of the material to be treated by the heating means is elevated prior to its entry into the heating means.

SEE OR SEARCH CLASS

432, Heating,

163+, for furnaces of general utility having plural structurally-related work chambers.