Registers – Records – Magnetic
Patent
1979-05-04
1981-04-07
Cook, Daryl W.
Registers
Records
Magnetic
235488, G06K 1906
Patent
active
042608813
ABSTRACT:
An activatable, and deactivatable electronic status determining label of ferromagnetic construction, and 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-magnetization technics; or by adding a great multiplicity of crossing lines of magnetic saturation and thus breaking the ferromagnetic substance up into a multiplicity of small 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), Lichtblav
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