Secure authentication feature
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United States of America Patent
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Nov 26, 2013
Grant Date -
Aug 11, 2011
app pub date -
Jul 25, 2008
filing date -
Jul 26, 2007
priority date (Note) -
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Abstract
A security tag comprising at least one overt data carrier (10), and at least one covert data carrier (25), the covert data carrier comprising a ring (25) that is formed around the overt data carrier (10). The covert data carrier (25) is invisible to the unaided eye when lit with visible light, but visible when illuminated with other light, for example UV light.
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