Secure product authentication tags

Details Secure product authentication tags Secure product authentication tags

2007-05-14

2010-06-29

Ross, Dana (Department: 3725)

Printed matter

Having revealable concealed information, fraud preventer or...

C283S117000, C283S901000, C283S073000, C428S029000

Reexamination Certificate

active

07744130

ABSTRACT:
A tag with features to enable its authenticity to be determined includes a hidden code intermixed with a visible pattern such that the hidden code is not readily detectable under ambient light condition, without the use of a specially designed reader. In one embodiment the tag is formed with a first layer containing a hidden code, formed of reflective elements, which overlies a second layer which is designed to absorb light having a predetermined wavelength (e.g., IR light). The hidden code can be detected by projecting a light source having the predetermined wavelength (e.g., an IR source) at a predetermined angle on the tag and using a sensor to sense the reflection from the tag.

REFERENCES:
patent: 3887742 (1975-06-01), Reinnagel
patent: 6955839 (2005-10-01), Gocho et al.
patent: 2006/0097512 (2006-05-01), Isherwood

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