US PATENT SUBCLASS 373 / 112
.~.~ Vacuum

Current as of: June, 1999
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373 /   HD   INDUSTRIAL ELECTRIC HEATING FURNACES

109  DF  RESISTANCE FURNACE DEVICE {7}
110  DF  .~ With internal atmosphere control (e.g., pressure, vacuum, etc.) {2}
112.~.~ Vacuum

DEFINITION

Classification: 373/112

Vacuum:

(under subclass 110) Subject matter wherein the environment within the furnace housing is regulated to have a vacuum.

SEE OR SEARCH THIS CLASS, SUBCLASS:

141, for induction furnace apparatus to provide and maintain a vacuum within the furnace.