US PATENT SUBCLASS 327 / 446
.~.~.~.~.~ 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}
444  DF  .~.~.~ Complex wave supply {1}
445  DF  .~.~.~.~ Silicon controlled rectifier (SCR) {1}
446.~.~.~.~.~ Triac

DEFINITION

Classification: 327/446

Triac:

(under subclass 445) 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.