US PATENT SUBCLASS 266 / 255
.~.~.~ Having work contained in separate, noncommunicating chamber, e.g., muffle

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}
255.~.~.~ Having work contained in separate, noncommunicating chamber, e.g., muffle {1}
256  DF  .~.~.~.~> Bell furnace

DEFINITION

Classification: 266/255

(under subclass 252) Device wherein the article to be heated is disposed within a receptacle and is maintained out of direct contact with the source of heat or gases evolved thereby.

SEE OR SEARCH THIS CLASS, SUBCLASS:

262, for a means for treating a solid metal within a fluid tight heat transferring box shield, e.g., annealing box.