US PATENT SUBCLASS 373 / 19
.~ Indirect heating

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

18  DF  PLASMA FURNACE DEVICE {3}
19.~ Indirect heating {1}
20  DF  .~.~> Rotary furnace

DEFINITION

Classification: 373/19

Indirect heating:

(under subclass 18) Subject matter wherein the material being heated is heated principally by heat radiation from the plasma flame, without direct contact with the flame.

SEE OR SEARCH THIS CLASS, SUBCLASS:

61+, for arc furnace indirect heating details.