US PATENT SUBCLASS 327 / 455
.~.~.~.~.~ 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}
453  DF  .~.~.~.~ Silicon controlled rectifier (SCR) {4}
455.~.~.~.~.~ Triac {4}
456  DF  .~.~.~.~.~.~> Plural
457  DF  .~.~.~.~.~.~> Combined with diac
458  DF  .~.~.~.~.~.~> Combined with diverse four or more layer device
459  DF  .~.~.~.~.~.~> With bipolar transistor


DEFINITION

Classification: 327/455

Triac:

(under subclass 453) 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.