Security markers for indicating condition of an item

Details Security markers for indicating condition of an item Security markers for indicating condition of an item

2008-05-27

2008-05-27

Lee, John R. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

C250S559440, C250S484400, C250S486100

Reexamination Certificate

active

07378675

ABSTRACT:
A method of indicating the condition of an item comprises illuminating the item to excite one or more photoluminescent markers incorporated within the item. Photoluminescent emission from the markers in response to the excitation is compared to one or more pre-defined photoluminescent signatures indicating different conditions of the item.

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