US PATENT SUBCLASS 219 / 75
.~.~.~ Nonconsumable electrode (e.g., atomic hydrogen)

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  DF  .~.~ Gas supply (e.g., by ingredient of electrode, by external source) {1}
75.~.~.~ Nonconsumable electrode (e.g., atomic hydrogen)

DEFINITION

Classification: 219/75

(under subclass 74) Subject matter in which the electric heating arc is of the nonconsumable electrode type.

(1) Note. This subclass relates, for example, to arc torches utilized in atomic hydrogen welding, in which the tungsten electrodes wear away only slowly.