Electronic surveillance using self-powered article attached tags

Details Electronic surveillance using self-powered article attached tags Electronic surveillance using self-powered article attached tags

1985-09-30

1987-08-11

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340571, G08B 1318

Patent

active

046865136

ABSTRACT:
Alarm tags releasably attachable to articles to be monitored in a retail installation or the like have enhanced operational capabilities giving rise to an improved likelihood of detection of article theft. The system has a transmitter unit which radiates signals containing diverse message contents. The tags each include an attachment device for releasably securing the tag to an article, a receiver unit for receiving such radiated signals and decoding the messages therein, an alarm unit and a signal processor, the latter being responsive to the state of the attachment device and to decoded messages for selectively operating the alarm unit to provide sensible output alarm indication.
In a preferred embodiment, the system includes a transmitter in an exit area of the retail installation which radiates a signal containing a first message for receipt only by tags in such area and has a transmitter in a checkout area which radiates signals containing various selectable messages for article checkout purposes.

REFERENCES:
patent: 3713133 (1973-01-01), Nathans
patent: 4511888 (1985-04-01), Bernhardt
patent: 4559529 (1985-12-01), Bernhardt
patent: 4573042 (1986-02-01), Boyd et al.

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