Registers – Systems controlled by data bearing records – Credit or identification card systems
Patent
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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