US PATENT SUBCLASS 219 / 130.51
.~.~.~.~ Pulsating or periodic output

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}
130.5  DF  .~.~.~ With predetermined time variation of arc voltage or current (e.g., programmed) {1}
130.51.~.~.~.~ Pulsating or periodic output

DEFINITION

Classification: 219/130.51

Pulsating or periodic output:

(under subclass 130.5) Subject matter wherein the preestablished temporal pattern exhibits a nonsinusoidal repeating waveform.

(1) Note. This subject matter will include square waves or

rectified sinusoids.