Method of fabricating authentication labels and authenticating p

Details Method of fabricating authentication labels and authenticating p Method of fabricating authentication labels and authenticating p

1997-01-10

1999-01-05

Duda, Kathleen

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making named article

430321, 430323, 430 10, 216 24, G03F 700

Patent

active

058560700

ABSTRACT:
An authenticating pattern 20 for valuable objects is fabricated as an integrated structure of a substrate layer 21 and a transparent overcoat layer 22 with a viewable interface therebetween containing a light diffracting structure 10. Unique parameters are randomly defined in the light diffracting structure by anisotropic process steps not under full control of the producer during the manufacturing of the diffracting structure to prevent copying or creating an exact replica thereof. The resultant uniquely coloured authenticating pattern can be verified by simple observation with the naked eye which is a prerequisite for ubiquitous verification.

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patent: 4746192 (1988-05-01), Minagawa
patent: 5003600 (1991-03-01), Deason et al.
patent: 5238786 (1993-08-01), Kashiwagi
patent: 5383687 (1995-01-01), Suess et al.
UK Patent Application GB 2093404 (Russell et al., Authenticated item with diffractive-subtractive authenticating device), Sep. 1982.

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