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US 2014/0197241 A1Published application
Covert coating for authentication of materials
AssigneeSpectra Systems Corporation
InventorNabil Lawandy
Life of this patent
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Abstract
Systems and methods for document and product authentication are provided using a combination of interacting absorption and emission materials that are formed into covert optically encoded markings. The markings are formed from at least one emitter and at least one absorber, that exhibit a first emission in response to a first excitation of the emitter and a change in that emission in response to excitation of the absorber such that various combinations of emitter and absorber materials create a machine readable response that cannot be detected by the human eye.
Claims16
A security feature for authenticating an article comprising:
- at least one emitter material that generates an emission within an emission band in response to a first excitation;
- and
- at least one absorber material that undergoes a change in absorption characteristics within at least a portion of said emission band in response to a second excitation,
- wherein said change in said absorption characteristics causes a non-apparent change in said emission.
1 more element
Dependencies are inferred from the claim text.