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Process for authenticity determination of security documents with security features in the form of luminescing substances

  • US 4,533,244 A
  • Filed: 03/07/1984
  • Issued: 08/06/1985
  • Est. Priority Date: 05/30/1980
  • Status: Expired due to Term
First Claim
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1. A process for authenticity determination of a security document, comprising:

  • providing said document with a luminescing substance having a known excitation spectrum and a known emission spectrum wherein at least a portion of said excitation spectrum and a portion of said emission spectrum are contained in a narrow band of wavelengths and at least a portion of said excitation spectrum overlaps at least a portion of said emission spectrum in said narrow wavelength band;

    exciting said document within said narrow band; and

    sensing the emissions of said security documents in said narrow band caused by said excitation in said narrow band.

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