US PATENT SUBCLASS 266 / 192
.~.~.~ By direct fluid contact

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}
190  DF  .~.~ With cooling of heating means {3}
192.~.~.~ By direct fluid contact

DEFINITION

Classification: 266/192

(under subclass 190) Device wherein the temperature of a specific portion of the heating means is maintained within acceptable limits by applying a cooling medium thereagainst, as for example, by flowing the medium over or impinging the medium against said portion.