Dual status magnetic marker having magnetically biasable flux co

Details Dual status magnetic marker having magnetically biasable flux co Dual status magnetic marker having magnetically biasable flux co

1988-02-01

1989-04-25

Myracle, Jerry W.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G01B 1318

Patent

active

048251976

ABSTRACT:
A dual status marker for use in electronic article surveillance systems having an alternating magnetic field. The marker comprises a magnetic responder element having a central switching portion and flux collectors on each end which concentrate flux within the switching portion to ensure that the flux density therein is sufficient to generate an approximate response. The marker is made dual status by providing magnetizable keeper elements adjacent the flux collectors. When the keeper elements are magnetized, the associated field biases the flux collectors and inhibits magnetization reversal therein in response to an interrogation field, thereby preventing flux from the interrogation field from being concentrated in the switching portion of the responder element.

REFERENCES:
patent: 3665449 (1972-05-01), Elder et al.
patent: 3747086 (1973-07-01), Peterson
patent: 3790945 (1974-02-01), Fearon
patent: 4075618 (1978-02-01), Montean
patent: 4660025 (1987-04-01), Humphrey
patent: 4710754 (1987-12-01), Montean
patent: 4746908 (1988-05-01), Montean

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