Security markers for indicating condition of an item

Gary A. Ross (Inventor), Graham I. Johnson (Inventor), Barrie Clark (Inventor), Simon J. Forrest (Inventor)

Research output: Patent


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.
Original languageEnglish
Patent numberUS 7,378,675 B2
Filing date2/11/05
Publication statusPublished - 27 May 2008
Externally publishedYes


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