US PATENT SUBCLASS 219 / 72
.~ Nonatmospheric environment at hot spot (e.g., resistance weld under oil, vacuum)

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

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

DEFINITION

Classification: 219/72

(under subclass 50) Subject matter in which a nonatmospheric environment is created at the region of electric heating.

(1) Note. The environment may, for example, be a bath of oil which prevents overheating and oxidation during resistance welding, or it may be a vacuum.

SEE OR SEARCH THIS CLASS, SUBCLASS:

68+, for similar subject matter utilized for cutting or disintegrating.

71, for similar subject matter in which a liquid environment acts as an electrode.

SEE OR SEARCH CLASS

228, Metal Fusion Bonding, 218+, for formation of a metallic bond in a nonatomospheric environment wherein heating is other than electrical.