US PATENT SUBCLASS 266 / 254
.~.~.~ With indirect heat-exchange means for gas

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

249  DF  MEANS TREATING SOLID METAL {5}
251  DF  .~ By contact with gas {2}
252  DF  .~.~ With heating means {4}
254.~.~.~ With indirect heat-exchange means for gas

DEFINITION

Classification: 266/254

(under subclass 252) Device wherein a separate means is provided for altering the temperature of the specific atmosphere which means is separate from the means heating the metallic articles.

SEE OR SEARCH THIS CLASS, SUBCLASS:

138+, for devices having means to elevate the temperature of the gas prior to the entry of the gas into the treating zone.