Anticopying film

Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond

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428 29, 428198, 428203, 4284111, 4284884, 428913, 428914, 283 72, 283100, 283107, 283110, B32B 300

Patent

active

055695221

ABSTRACT:
An anticopying film (2) for covering documents (1) appears opaque in vertical plan view (5) as a result of total reflection for protection against copying and appears transparent in the oblique viewing direction (6), the film having an irregular sawtooth structure (3). This makes it virtually impossible to produce an identical second film with the aid of which, by placing said second film on top, the effect of the anticopying film (2) might be eliminated.

REFERENCES:
patent: 3887742 (1975-06-01), Reinnagel et al.
patent: 4025673 (1977-05-01), Reinnagel
patent: 4184700 (1980-01-01), Greenaway
patent: 4303307 (1981-12-01), Tureck et al.
patent: 4786084 (1988-11-01), Karney et al.

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