Method for identifying articles and process for maintaining security
OwnerDamien F. Reardoninventor
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Abstract
The invention is directed to a method wherein at least a portion of a luminescent coating disposed on a surface of an article is exposed to ultraviolet light causing the luminescent coating to exhibit luminescence, detecting the luminescence, causing a comparison to be made between the luminescence and a predetermined standard, and classifying the article according to the comparison, wherein the luminescent coating has a luminescent chelate being a lanthanide and a ligand, the ligand being represented by the formula wherein R1 is alkyl, aryl, or heteroaryl; R2 is alkyl, aminoalkyl; aryl or heteroaryl.
Claims15
A method comprising exposing at least a portion of a luminescent coating disposed on a surface of an article to ultraviolet light causing the luminescent coating to exhibit luminescence, detecting the luminescence, causing a comparison to be made between the luminescence and a predetermined standard, and classifying the article according to the comparison, wherein the luminescent coating comprises a luminescent chelate comprising a lanthanide and a ligand, the ligand being represented by the formula
- wherein R1 is alkyl, aryl, or heteroaryl;
- R2 is alkyl, aminoalkyl;
- aryl or heteroaryl.
A method comprising within a first time period, disposing upon at least a portion of a surface of a first article a first luminescent coating wherein the first luminescent coating comprises a first luminescent chelate comprising a lanthanide and a ligand, the ligand being represented by the formula
- wherein R1 is alkyl, aryl, or heteroaryl;
- R2 is alkyl, aminoalkyl;
- aryl or heteroaryl;
- optionally, drying the coating;
- and, exposing the first coating to a first preselected wavelength of light wherein the first luminescent chelate exhibits a first luminescence spectrum having a first plurality of intensity peaks.
Dependencies are inferred from the claim text.