US PATENT SUBCLASS 340 / 572.2
.~.~.~.~ Specified relationship between field and detection frequencies (e.g., nth order harmonics)


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}
572.2.~.~.~.~ Specified relationship between field and detection frequencies (e.g., nth order harmonics)


DEFINITION

Classification: 340/572.2

Specified relationship between field and detection frequencies (e.g., nth order harmonics):

(under subclass 572.1) Subject matter where the detection system generates an interrogation field at a particular frequency, and the device or tag generates a response at another frequency having a predetermined correlation to the field frequency.