US PATENT SUBCLASS 327 / 452
.~.~.~.~.~ With triac

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

365  DF  GATING (I.E., SWITCHING INPUT TO OUTPUT) {12}
419  DF  .~ Utilizing three or more electrode solid-state device {7}
438  DF  .~.~ Four or more layer device (e.g., thyristor, etc.) {6}
447  DF  .~.~.~ AC supply {6}
451  DF  .~.~.~.~ Zero point switching {1}
452.~.~.~.~.~ With triac

DEFINITION

Classification: 327/452

With triac:

(under subclass 451) Subject matter including a bidirectional rectifier (essentially two SCRs in parallel) that functions as an electronically controlled switch for AC loads and having an npnpn structure that can be triggered into either forward or reverse conduction (i.e., transmits AC power across its anode-cathode) by a pulse applied to its gate electrode.