US PATENT SUBCLASS 219 / 130.21
.~.~.~ With automatic output control (e.g., shortcircuit, infrared)

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

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
121.11  DF  .~ By arc {16}
130.1  DF  .~.~ Including arc-power supplies {5}
130.21.~.~.~ With automatic output control (e.g., shortcircuit, infrared) {3}
130.31  DF  .~.~.~.~> Responsive to arc voltage only
130.32  DF  .~.~.~.~> Responsive to arc current only
130.33  DF  .~.~.~.~> Responsive to both arc voltage and arc current

DEFINITION

Classification: 219/130.21

With automatic output control (e.g., short circuit, infrared):

(under subclass 130.1) Subject matter including circuit means for regulating the output in response to a sensed condition.

SEE OR SEARCH THIS CLASS, SUBCLASS:

110, resistance welding with control in response to current, voltage, or temperature.

124.02, for gap control in arc welding.

SEE OR SEARCH CLASS

323, Electricity: Power Supply or Regulation Systems, appropriate subclasses for automatic output control.