Patent ID: 7767315
Filing Date: 2010-08-03
Classification: B41M,B42D,C09K,D21H,Y10T

Abstract:
1. A method of authenticating or identifying an article that has been marked with or incorporates a fluorescent complex that, when exposed to ultra-violet light, produces a main emission peak at a main emission frequency of the complex and a set of side peaks at frequencies different from the main emission frequency of the complex, said complex being selected from the group consisting of: A. type (i) materials having the general chemical formula where: M is an element selected from the group consisting of lanthanide series elements and actinide series elements, n is the valence state of the element M, Lα is an organic complex which consists of a single ligand or multiple ligands which may be the same or different, and Lp is an organic complex which consists of a single ligand or multiple ligands which may be the same or different; and, B. type (ii) materials having the general chemical formula where: M M Lα is an organic complex which consists of a single ligand or multiple ligands which may be the same or different, and n is the combined valence state of M said method comprising the steps of: