US PATENT SUBCLASS 340 / 572.5
.~.~.~.~ Having tuned resonant circuit

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
540  DF  .~ Specific condition {18}
568.1  DF  .~.~ Article placement or removal (e.g., anti-theft) {9}
572.1  DF  .~.~.~ Detectable device on protected article (e.g., "tag") {7}
572.5.~.~.~.~ Having tuned resonant circuit

DEFINITION

Classification: 340/572.5

Having tuned resonant circuit:

(under subclass 572.1) Subject matter where the device or tag has a circuit which is capable of adjusting to respond to a particular frequency wave.

SEE OR SEARCH CLASS

334, Tuners, for tuners, per se.