Deactivatable/reactivatable magnetic marker having a step change

Details Deactivatable/reactivatable magnetic marker having a step change Deactivatable/reactivatable magnetic marker having a step change

1992-07-02

1994-05-17

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

148108, 340572, G08B 1324

Patent

active

053131924

ABSTRACT:
A marker for use in an electronic article surveillance system in which the marker comprises a magnetically soft component and exhibits a pinned wall hysteresis characteristic with a step change in flux at a threshold value of applied field and in which the marker further comprises a magnetically hard or semi-hard component integral with the soft component and whose magnetic state can be switched between activating and deactivating states to switch the marker between active and deactive states.

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