Detection of articles in adjacent passageways

Details Detection of articles in adjacent passageways Detection of articles in adjacent passageways

1980-02-19

1981-06-16

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

Specific condition

340505, 340568, G08B 1324

Patent

active

042740908

ABSTRACT:
An article theft detection system for identifying which of two adjacent passageways a protected article passes. Each passageway is provided with spaced apart interrogation and receiver antennas, but a single receiver antenna services both passageways. Multiplexing is used to energize the interrogation antennas in alternate sequence. The single receiver antenna is connected to a single receiver whose output is connected through switches, synchronized with the interrogation multiplexing, to separate alarms for each passageway.

REFERENCES:
patent: 3500373 (1970-03-01), Minasy et al.
patent: 3707711 (1972-12-01), Cole et al.
patent: 3818472 (1974-06-01), Mauk et al.
patent: 3838409 (1974-09-01), Minasy et al.
patent: 4118693 (1978-10-01), Novikoff
patent: 4135184 (1979-01-01), Pruzick

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