Theft monitoring apparatus

Details Theft monitoring apparatus Theft monitoring apparatus

1997-11-21

1999-04-13

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

3405721, 3405681, G08B 1314

Patent

active

058942696

ABSTRACT:
A theft monitoring apparatus does not require any complicated synchronous relationship for the signals received from a plurality of antennas, permits easier installation and maintenance and inspection, and does not adversely affect the appearance of a shop where it is installed. A plurality of antennas (1, 2) send out transmitter signals composed of burst signals (A, B) which continue in predetermined cycles (T1, T2). The transmitter signal from one antenna (antenna 2) except other antenna (antenna 1) is provided with a pause period (D) during which no burst signal (B) is issued. During the pause period (D), the burst signal (A) is issued from the antenna (1).

REFERENCES:
patent: 5353011 (1994-10-01), Wheeler et al.
patent: 5519381 (1996-05-01), Marsh et al.
patent: 5589819 (1996-12-01), Takeda
patent: 5684828 (1997-11-01), Bolan et al.
patent: 5686902 (1997-11-01), Reis et al.
patent: 5726630 (1998-03-01), Marsh et al.

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