US PATENT SUBCLASS 327 / 457
.~.~.~.~.~.~ Combined with diac

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  DF  .~.~.~.~.~ Triac {4}
457.~.~.~.~.~.~ Combined with diac

DEFINITION

Classification: 327/457

Combined with diac:

(under subclass 455) Subject matter including a triac and a three layer (npn), two terminal switching semiconductor device.

(1) Note. A diac is also called a three layer diode, a two-lead alternating current switching semiconductor, or a two-terminal voltage controlled device which exhibits a bilateral negative resistance characteristic.