US PATENT SUBCLASS 266 / 171
.~ By means applying heat to work, e.g., furnace

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.~ By means applying heat to work, e.g., furnace {10}
172  DF  .~.~> Fluidized zone
173  DF  .~.~> Rotary drum-type furnace
174  DF  .~.~> With safety device
175  DF  .~.~> With separate preheat chamber
176  DF  .~.~> With means for moving solid material to or through heating zone {4}
185  DF  .~.~> With work supporting grate
186  DF  .~.~> With means for feeding fluids {3}
190  DF  .~.~> With cooling of heating means {3}
195  DF  .~.~> With discharge means {1}
197  DF  .~.~> Shaft-type furnace, e.g., blast furnace {2}

DEFINITION

Classification: 266/171

(under subclass 168) Device having means to raise the temperature of metalliferous material.

(1) Note. Those furnaces which are alternately usable to melt metal or to treat ore will be found herein.

SEE OR SEARCH CLASS

75, Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, and Loose Metal Particulate Mixtures, appropriate subclass, for processes of treating ore or extracting metal.

432, Heating, appropriate subclass, for treating furnaces of general utility.