Detection system

Details Detection system Detection system

1979-05-21

1981-06-16

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

Specific condition

340539, 340568, G08B 1322

Patent

active

042740894

ABSTRACT:
A merchandise security system in which a signal having a first frequency is generated and is multiplied or divided by n to provide a signal having a second frequency which is transmitted. A responder circuit in a tag on the merchandise divides or multiplies the transmitted signal by n and transmits it to a receiver where it is compared with the originally generated first frequency and is used to produce an alarm signal.

REFERENCES:
patent: 3798642 (1974-03-01), Augenblick et al.
patent: 3983552 (1976-09-01), Bakeman, Jr. et al.

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