US PATENT SUBCLASS 219 / 74
.~.~ Gas supply (e.g., by ingredient of electrode, by external source)

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
72  DF  .~ Nonatmospheric environment at hot spot (e.g., resistance weld under oil, vacuum) {2}
74.~.~ Gas supply (e.g., by ingredient of electrode, by external source) {1}
75  DF  .~.~.~> Nonconsumable electrode (e.g., atomic hydrogen)

DEFINITION

Classification: 219/74

(under subclass 72) Subject matter in which the nonatmospheric environment is a gas whose composition is not that of air or in which the nonatmospheric environment is compressed or rarified air.

(1) Note. The environment may be formed by the gases liberated by the coating of a "shielded" electrode (e.g., coated electrode) when an arc is struck from the electrode, or by an external gas supply connected to a hand held torch.

SEE OR SEARCH THIS CLASS, SUBCLASS:

122, for this subject matter.

SEE OR SEARCH CLASS

313, Electric Lamp and Discharge Devices,

231.01+, for analogous subject matter, not utilized to heat metal. 314, Electric Lamp and Discharge Devices: Consumable Electrodes,

22, for arc lamps having auxiliary fluent material feed to the arc.

315, Electric Lamp and Discharge Devices: Systems,

111.01+, for systems, not utilized to heat metal, analogous to the systems of this subclass.