Electro-magnetic desensitizer

Details Electro-magnetic desensitizer Electro-magnetic desensitizer

1993-03-18

1998-09-08

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

340572, G08B 1324

Patent

active

058050655

ABSTRACT:
A magnetic security marker of an article surveillance system is deactivated by first determining the status of the marker by exposing it to the interrogating field. If the marker is active, a deactivation field is applied to the marker. The marker is again interrogated using the interrogating field and, if an active marker is detected, an incrementally increased deactivation field is applied. The marker is continually interrogated and, as long as an active marker is detected, the intensity of the field is incrementally increased until the field reaches a level effecting deactivation.

REFERENCES:
patent: 3820104 (1974-06-01), Fearon
patent: 4484184 (1984-11-01), Gregor et al.
patent: 4906974 (1990-03-01), Rehder
patent: 5027106 (1991-06-01), Lizzi et al.
patent: 5210524 (1993-05-01), Schwarz et al.
patent: 5341125 (1994-08-01), Plonsky et al.

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