Ferromagnetic marker pairs for detecting objects having marker s

Details Ferromagnetic marker pairs for detecting objects having marker s Ferromagnetic marker pairs for detecting objects having marker s

1976-06-24

1979-04-24

Cook, Daryl W.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235493, 325 8, 340572, 343787, G06K 500, G06K 1906, G08B 1326, H04B 714

Patent

active

041514050

ABSTRACT:
An activatable, and deactivatable ferromagnetic marker useful in tagging objects to permit selective detection of tagged objects depending upon the activation state of the marker. The marker comprises a pair of ferromagnetic elements capable of generating harmonics of an exciting oscillatory interrogating field. Both elements of each pair are essentially identical, having identical dimensions, weights and ferromagnetic properties. In one activation state, the pair generates predominately the even harmonics of the oscillatory field, while in a second activation state the pair generates predominately the odd harmonics of the oscillatory interrogating field. The system includes the marker attached to, or built within, selected objects, a means for selectively switching between the two activation states, an interrogation field, and detection means. In view of the fact that in today's technology, each marker pair can be balanced to a high degree of accuracy, and the fact that the two states of activation are precise, high sensitivity and certainty of responses are both possible.

REFERENCES:
patent: 3154761 (1964-10-01), O'Gorman
patent: 3651312 (1972-03-01), Barney
patent: 3803634 (1974-04-01), Namikawa
patent: 3823405 (1974-07-01), Andreaggi et al.
patent: 3862399 (1975-01-01), Cain
patent: 3896292 (1975-07-01), May et al.
patent: 3998160 (1976-12-01), Pearce

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