Marking of articles
First Claim
1. An article for identification which can be authenticated by sequential irradiation by at least two different wavelengths of ultraviolet radiation comprising a substrate having authentication markings which are provided by at least two fluorescent materials which are excited to fluoresce by said different wavelengths of ultraviolet radiation, and when excited fluoresce with different colors in the visible region of the spectrum, each of said fluorescent materials being incorporated homogeneously in a body of plastics material, the substrate also carrying visual identification data.
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Accused Products
Abstract
An article comprising a substrate having markings which are provided by at least two fluorescent materials which have different excitation spectra in the ultraviolet region of the spectrum and different emission spectra in the visible region of the spectrum. The invention also provides a method of marking an article for identification.
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Citations
30 Claims
- 1. An article for identification which can be authenticated by sequential irradiation by at least two different wavelengths of ultraviolet radiation comprising a substrate having authentication markings which are provided by at least two fluorescent materials which are excited to fluoresce by said different wavelengths of ultraviolet radiation, and when excited fluoresce with different colors in the visible region of the spectrum, each of said fluorescent materials being incorporated homogeneously in a body of plastics material, the substrate also carrying visual identification data.
- 16. A method of marking an article for identification, the method comprising providing the article with at least two fluorescent materials which are excited to fluoresce by at least two different wavelengths of ultraviolet radiation, and when excited, fluoresce with different colors in the visible region of the spectrum, each fluorescent material being homogeneously incorporated in a body of plastics material, and also providing the article with visual identification data.
Specification