Sheet-material authenticated item with reflective-diffractive au

Details Sheet-material authenticated item with reflective-diffractive au Sheet-material authenticated item with reflective-diffractive au

1981-02-19

1990-01-09

Arnold, Bruce Y.

Printed matter

Maps

283 91, 427 7, 428916, G02B 518, B44F 112

Patent

active

048923850

ABSTRACT:
An improved authenticating device comprises a substrate bonded to the sheet material, the substrate having a reflective diffractive structure formed as a relief pattern on a viewable surface thereof, and a transparent material covering the structure. Specified grating parameters of the diffractive structure, obtainable at low cost, result in peculiar, but easily discernable, optical color properties that cannot be copied by color copying machines.

REFERENCES:
patent: 3643216 (1972-02-01), Greenaway et al.
patent: 4034211 (1977-07-01), Horst et al.
patent: 4119361 (1978-10-01), Greenaway
patent: 4184700 (1980-01-01), Greenaway
patent: 4304809 (1981-12-01), Moraw et al.

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