US PATENT SUBCLASS 323 / 320
.~ Phase controlled switching using electronic tube or a three or more terminal semiconductive device

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

318  DF  EXTERNAL OR OPERATOR CONTROLLED {5}
320.~ Phase controlled switching using electronic tube or a three or more terminal semiconductive device {6}
321  DF  .~.~> With soft start
322  DF  .~.~> With digital control
323  DF  .~.~> With interval timer
324  DF  .~.~> Using single unidirectional element with bidirectional pass
325  DF  .~.~> With a three or more terminal semiconductive device in trigger circuit {1}
327  DF  .~.~> With passive element only in trigger circuit

DEFINITION

Classification: 323/320

Phase controlled switching using electronic tube or a three or more terminal semiconductive device:

(under subclass 318) Subject matter wherein the input is alternating current and the final control device is an electronic tube or three or more terminal semiconductive device which is caused to change to its conductive state at a controllable point following the zero axis crossing of the

input waveform.

SEE OR SEARCH THIS CLASS, SUBCLASS:

237, for output responsive phase controlled switching systems.

300, for input responsive phase controlled switching systems.

SEE OR SEARCH CLASS

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,

447+, for semiconductor controlled rectifiers which are involved in phase switching.