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  • US 5,005,873 A
  • Filed: 01/22/1988
  • Issued: 04/09/1991
  • Est. Priority Date: 04/07/1986
  • Status: Expired due to Fees
First Claim
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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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