Coating processes – Fraud or tamper detecting
Patent
1995-06-02
1996-07-23
Bell, Janyce
Coating processes
Fraud or tamper detecting
427164, 427261, 427264, 427265, 427270, 427271, 427356, 427 855, 4274121, B44F 112
Patent
active
055387535
ABSTRACT:
A security element for the authentication of a substrate has a pattern comprising optical diffraction elements which are embossed in a carrier material of plastic material and unembossed neutral areas. On the embossing side of the carrier material a reflecting layer covers only surfaces with relief structures of the diffraction elements while the neutral areas which lie therebetween are free of the reflecting layer and are therefore non-reflecting. If the security element is stuck in the form of a stamp onto the substrate and the carrier metal is transparent, image portions, which are covered by the stamp, of a feature on the substrate can be discerned through the neutral areas.
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Antes Gregor
Trachslin Walter
Bell Janyce
Landis & Gyr Betriebs AG
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