Article monitoring apparatus and system

Details Article monitoring apparatus and system Article monitoring apparatus and system

2005-10-25

2005-10-25

Pham, Toan (Department: 2632)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S571000, C340S572100, C235S444000

Reexamination Certificate

active

06958695

ABSTRACT:
A tag has an intelligent function such that when radiation of a burst signal synchronized with a power source frequency from a transmission antenna (20) is detected, it transmits a response burst signal after completion of reception. Then, when a predetermined number of burst signals have been detected, the tag outputs an alarm. Also, an alarm device main body outputs an alarm when a predetermined number of response burst signals have been received. To provide article monitoring apparatus and article monitoring system which determine whether or not an unpaid article is taken out with reliability. According to the present invention, it is possible to provide article monitoring apparatus and article monitoring system which determine whether or not an unpaid article is taken out with reliability.

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patent: 2-43228 (1990-09-01), None

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