US PATENT SUBCLASS 373 / 140
.~ With internal atmosphere control (e.g., pressure, vacuum, etc.)

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

138  DF  INDUCTION FURNACE DEVICE {10}
140.~ With internal atmosphere control (e.g., pressure, vacuum, etc.) {1}
141  DF  .~.~> Vacuum

DEFINITION

Classification: 373/140

With internal atmosphere control (e.g., pressure, vacuum, etc.):

(under subclass 138) Subject matter including means to regulate the surrounding conditions of the charge.

SEE OR SEARCH THIS CLASS, SUBCLASS:

68, and 77, for arc furnaces with internal atmosphere control.

110, for resistance furnaces with internal atmosphere control.