US PATENT SUBCLASS 373 / 23
.~.~ Expanded arc column

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

18  DF  PLASMA FURNACE DEVICE {3}
22  DF  .~ Direct furnace (i.e., plasma flame impinges on the melt) {3}
23.~.~ Expanded arc column

DEFINITION

Classification: 373/23

Expanded arc column:

(under subclass 22) Subject matter wherein the plasma flame expands, usually in a conical shape, as it extends away from the plasmatron.