Optically detectable security feature

Details Optically detectable security feature Optically detectable security feature

2006-10-31

2006-10-31

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S483100, C250S492100, C356S071000, C252S301340, C252S301350, C252S301360, C252S30140R, C252S30140F, C428S195100, C428S690000, C283S074000, C283S087000, C283S092000, C194S207000

Reexamination Certificate

active

07129506

ABSTRACT:
An optically detectable security marker for emitting light at a pre-selected wavelength. The marker comprises a rare earth dopant and a carrier incorporating the rare earth dopant. The interaction of the carrier and the dopant is such that the fluorescent fingerprint of the marker is different from that of the rare earth dopant. The marker may be incorporated into a plurality of items, such as fluids, for example paint, fuel or ink, and laminar products such as paper or banknotes or credit cards.

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