Compositions having multiple responses to excitation radiation and methods for making same
AssigneeCabot Corporation
InventorsMark J. Hampden-Smith, Liam Noailles, Richard A. Einhorn
Life of this patent
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Abstract
The present invention relates to a composition having a first response to a first electromagnetic radiation and, after intermediate exposure to a second electromagnetic radiation, a second response to the first electromagnetic radiation, different from the first response. In one aspect, the composition exhibits a regenerated first response to the first electromagnetic radiation after exposure to a third electromagnetic radiation.
Claims10
A method for authenticating an article by using a regenerable composition comprising a plurality of forms having a plurality of responses, the method comprising:
- subjecting the composition to a first electromagnetic radiation and generating a first response;
- applying a second electromagnetic radiation to transform the composition from a first form having the first response to a second form having a second response to the first electromagnetic radiation that is different from the first response;
- and
- subjecting the composition to the first electromagnetic radiation and generating the second response,
- wherein the composition comprises a host material, an emissive material, and an emission modifier, and
- wherein the composition is incorporated into a security feature for authenticating the article.
Dependencies are inferred from the claim text.