US PATENT SUBCLASS 373 / 77
.~.~ With internal atmosphere control (e.g., pressure, vacuum, etc.)

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

60  DF  ARC FURNACE DEVICE {9}
71  DF  .~ Furnace body detail {4}
77.~.~ With internal atmosphere control (e.g., pressure, vacuum, etc.)

DEFINITION

Classification: 373/77

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

(under subclass 71) Subject matter wherein the furnace body is sealed and means are provided to increase the pressure within the furnace, or to create a vacuum therein.