US PATENT SUBCLASS 373 / 120
.~.~ Open circuit (e.g., charge internal resistance heating)

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

109  DF  RESISTANCE FURNACE DEVICE {7}
117  DF  .~ With heating element detail {7}
120.~.~ Open circuit (e.g., charge internal resistance heating) {4}
121  DF  .~.~.~> Salt bath heating
122  DF  .~.~.~> Including crucible or hearth structure details
123  DF  .~.~.~> With preheating {1}
125  DF  .~.~.~> Including terminal detail {1}

DEFINITION

Classification: 373/120

Open circuit (e.g., charge internal resistance heating):

(under subclass 117) Subject matter wherein a molten material completes the circuit and the internal resistance of the molten material is the heating element.

SEE OR SEARCH THIS CLASS, SUBCLASS:

58, for open circuit resistance furnaces with a condensating device.