Anti-shoplifting security system

Details Anti-shoplifting security system Anti-shoplifting security system

1996-08-16

1997-12-30

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G08B 1314

Patent

active

057035660

ABSTRACT:
This invention relates to detecting the presence of a soft magnetic marker in an interrogation zone. A low frequency electromagnetic field is produced utilizing dual frequency generators causing the magnetic marker to produce a phase shift of the modulation of transmission harmonics. These signals are readily distinguished from ferrous alloys and noise.

REFERENCES:
patent: 4710752 (1987-12-01), Cordery
patent: 4779076 (1988-10-01), Weaver
patent: 4791412 (1988-12-01), Brooks
patent: 5005001 (1991-04-01), Cordery

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