US PATENT SUBCLASS 373 / 61
.~ Indirect

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

60  DF  ARC FURNACE DEVICE {9}
61.~ Indirect {3}
62  DF  .~.~> Arc between spaced electrodes {2}
65  DF  .~.~> Arc between electrode and crucible exterior
66  DF  .~.~> Combined with or convertible to direct arc furnace

DEFINITION

Classification: 373/61

Indirect:

(under subclass 60) Subject matter wherein the arc is between spaced electrodes, or between an electrode and the crucible exterior and the material is heated by radiation from the arc.