System for detecting a transfer of an article

Details System for detecting a transfer of an article System for detecting a transfer of an article

1987-07-14

1989-04-04

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340527, 340554, G08B 1324

Patent

active

048189731

ABSTRACT:
A system for detecting a transfer of article comprising a card attached to the article and a detector. When the article having the card is transferred to a monitoring area, electromagnetic signals are transmitted in advance from the detector to the monitoring area, and received by the card. Then, high frequency signals are transmitted from the card to the detector, thereby a transfer of the article can be detected.

REFERENCES:
patent: 3713133 (1973-01-01), Nathans
patent: 3859652 (1975-01-01), Hall et al.
patent: 3891980 (1975-06-01), Lewis et al.
patent: 4054871 (1977-10-01), Terrell et al.

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