Registers – Systems controlled by data bearing records – Credit or identification card systems
Patent
1976-10-22
1979-06-19
Cook, Daryl W.
Registers
Systems controlled by data bearing records
Credit or identification card systems
235493, 340572, G06K 500, G06K 1906
Patent
active
041584341
ABSTRACT:
An activatable, and deactivatable ferromagnetic memory label of broad application in tagging objects to permit selective detection of tagged objects depending upon the activation state of the label. The label comprises a thin, layered structure of any size and shape having a central layer of ferromagnetic substance sandwiched between two thin non-magnetic covers. The activated state is derived by producing a multiplicity of magnetically saturated lines, or grooves, in the ferromagnetic substance, each of which is magnetically biased to receive and momentarily store radiant energy from an interrogating read-out zone and return same to the zone in a form characteristic of the label. The deactivated state is derived in two ways: by removing the saturation lines from the ferromagnetic substance, using well-known de-magnetication technics; or by adding a great multiplicity of crosslinking lines of magnetic saturation and thus breaking the ferromagnetic substance up into a multiplicity of small relatively inactive uncoordinated areas.
REFERENCES:
patent: 3292161 (1966-12-01), Broadbent
patent: 3465317 (1969-09-01), Rabinow et al.
patent: 3508219 (1970-04-01), Brownlow et al.
patent: 3577136 (1971-05-01), Wolf
patent: 3631442 (1971-12-01), Fearon
patent: 3651503 (1972-03-01), Kono
patent: 3711848 (1973-01-01), Martens
patent: 3810147 (1974-05-01), Lichtblau
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