Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-01-17
1989-11-28
Myracle, Jerry W.
Communications: electrical
Condition responsive indicating system
Specific condition
340551, G01B 1318
Patent
active
048840637
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 appropriate response. The marker is made dual status by providing magnetizable keeper elememts 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
Church Russell W.
Heltemes Eugene C.
Barte William B.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Myracle Jerry W.
Sell Donald M.
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