US PATENT SUBCLASS 323 / 258
.~.~.~ With electronic tube or a three or more terminal semiconductive device as tap switch

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}
255  DF  .~.~ Having a variable length winding (e.g., tapped) as the final control device {2}
258.~.~.~ With electronic tube or a three or more terminal semiconductive device as tap switch

DEFINITION

Classification: 323/258

With electronic tube or a three or more terminal semiconductive device as tap switch:

(under subclass 255) Subject matter wherein at least one of the several contacts is connected to the output through an electronic tube or a three or more terminal semiconductive device.

(1) Note. Devices in this subclass may include mechanical tap changers having a tube or semiconductive device associated therewith, usually for the purpose of arc suppression.