US PATENT SUBCLASS 323 / 254
.~.~.~ With electronic tube or a three or more terminal semiconductive device in control circuit

Current as of: June, 1999
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323 /   HD   ELECTRICITY: POWER SUPPLY OR REGULATION SYSTEMS

234  DF  OUTPUT LEVEL RESPONSIVE {6}
247  DF  .~ Using a transformer or inductor as the final control device {5}
249  DF  .~.~ Controllably saturable {3}
254.~.~.~ With electronic tube or a three or more terminal semiconductive device in control circuit

DEFINITION

Classification: 323/254

With electronic tube or a three or more terminal semiconductive device in control circuit:

(under subclass 249) Subject matter wherein the control circuit includes at least one electronics tube or three or more terminal semiconductive device connected to the control winding of the transformer.

SEE OR SEARCH THIS CLASS, SUBCLASS:

339, for external or operator controlled devices of this type.