Variable density verification
AssigneeVerify First Technologies, Inc.
InventorGeorge K. Phillips
Life of this patent
Estimating the term…
Abstract
A counterfeit-resistant document comprises a contrasting layer and a dynamic camouflaging layer. The contrasting layer is highly contrastive and includes a latent message that can be reproduced over a broad range of copy device control settings. The dynamic camouflaging layer is applied over the contrasting layer to suppress the latent message. The visual density of the dynamic camouflaging layer, which comprises a camouflage pattern that is printed in thermochromic ink, inversely varies with temperature. In this manner, the dynamic camouflaging layer is inactivated at room temperatures so that the latent message is suppressed on the original document, and activated at scanning temperatures so that the latent message is exhibited on a reproduction of the original document.
Claims44
A counterfeit-resistant document, comprising:
- a substrate;
- a contrasting layer disposed on said substrate;
- and
- a dynamic camouflaging layer disposed on and masking said contrast layer when viewing an original of said document under human viewing conditions independent of viewing angle.
A counterfeit-resistant document, comprising:
- a substrate;
- a contrasting layer disposed on said substrate;
- and
- a dynamic camouflaging layer disposed on and masking said contrasting layer when viewing an original of said document under human viewing conditions, said dynamic camouflaging layer comprising an environmentally density changing ink.
A method of creating a counterfeit-resistant document, the method comprising the steps:
- selecting a graphics pattern for a contrasting layer;
- selecting a graphics pattern for a dynamic camouflaging layer;
- applying said contrasting layer pattern to said substrate to create a contrasting layer on said substrate;
- and
- applying said dynamic camouflaging pattern to said contrasting layer to create a dynamic camouflaging layer that masks said contrasting layer when viewing an original of said document under human viewing conditions.
Dependencies are inferred from the claim text.