Card – picture – or sign exhibiting – Check – label – or tag – Baggage checks
Patent
1975-08-01
1976-05-11
Cannon, J. C.
Card, picture, or sign exhibiting
Check, label, or tag
Baggage checks
40 2R, 252 6251, 283 6, 283 7, 283 19, 283 58, 428204, 428206, 428323, 428325, 428900, G09F 300, H01F 1002
Patent
active
039552950
ABSTRACT:
A data bearing card having a magnetizable, transparent, colorless coating thereon is disclosed. The coating can comprise a transparent, colorless plastic matrix containing a dispersed particulate crystalline phase. The dispersed phase is prepared by mixing 20-60% of a rare earth compound containing a colorless ferromagnetic ion such as gadolinium with 0.1-5% of titanium dioxide or zirconium oxide, 0.05-2.5% of an inorganic fluoride salt and the balance up to 100% of a glass forming matrix such as inorganic borates. The mixture is heated above its melting point to form a homogeneous melt and subsequently crystallized. The resulting crystalline product can be ground to any desired particle size for dispersion in the transparent plastic matrix.
In general, the coating composition is useful in all applications where magnetic coatings are presently used. A distinct advantage is its colorless, transparent appearance which extends the range of uses to those applications where it is necessary and/or desirable to have a magnetic coating which is aesthetically pleasing or which is transparent. It is particularly important to form magnetic stripes on data cards such as credit cards, key cards for obtaining access to vending machines and restricted areas, bank checks, inventory control tags, etc. without the concomitant disadvantage of dark coloring, such as the unsightly dark brown associated with iron oxide.
REFERENCES:
patent: 3320170 (1967-05-01), Vickery et al.
patent: 3922430 (1975-11-01), Mayer
Brook David E.
Cannon J. C.
Kuhns Roberta B.
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