US PATENT SUBCLASS 373 / 18
PLASMA FURNACE DEVICE


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

18PLASMA FURNACE DEVICE {3}
19  DF  .~> Indirect heating {1}
21  DF  .~> Remelting furnace (i.e., ingot remelting)
22  DF  .~> Direct furnace (i.e., plasma flame impinges on the melt) {3}


DEFINITION

Classification: 373/18

PLASMA FURNACE DEVICE:

(under the class definition) Subject matter including a plasma generating means as the heat source to melt, or otherwise treat the material within the furnace device.

(1) Note. A plasma flame is generated when an ionizable gas is forced through an electrical field.

(2) Note. Plasmatrons are also referred to as "arc torches," "plasma guns", etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

13+, for electron beam vaporizing furnace gun assembly details.

24, for direct plasma furnaces with side wall mounted plasmatrons.

SEE OR SEARCH CLASS 313, Electric Lamp and Discharge Devices,

231.31+, for fluent material supplied plasma devices.

315, Electric Lamp and Discharge Devices: Systems,

111.21+, for plasma generating systems.