Deactivatable anti-theft security strip

Details Deactivatable anti-theft security strip Deactivatable anti-theft security strip

1991-02-25

1992-07-14

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

Specific condition

340572, G08B 1324

Patent

active

051306980

ABSTRACT:
A deactivatable anti-theft security strip has a soft-magnetic constituent and a hard-magnetic constituent. The hard-magnetic constituent is used for two purposes. It is used first to stress the soft-magnetic constituent and thereby to promote a fast magnetic reversal, and it is also used to deactivate the strip by magnetization. The pre-stressed, soft-magnetic constituent produces defined, steep pulses even in the presence of a slow magnetic reversal, so that the anti-theft security strip is especially suited for alternating fields having low frequencies, for example 50 or 60 Hz.

REFERENCES:
patent: 3820090 (1974-06-01), Wiegand
patent: 4591788 (1986-05-01), Mohri et al.
patent: 4652863 (1987-03-01), Hultman
patent: 4660025 (1987-04-01), Humphrey
patent: 4950550 (1990-08-01), Radeloff et al.

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