Method of checking the authenticity of papers and physically identifiable paper for use in said method
AssigneePapierfabrieken Van Houtem & Palm B.V.
InventorsHendrik D. Dokter, Roelof Hildering, Adrianus Mackor
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Abstract
A method of checking the authenticity of papers, such as banknotes, is provided which comprises using authentic paper containing a minor amount of substance showing an ESR spectrum at room temperature and checking the authenticity by ESR spectroscopy, as well as paper for use in said method, containing a minor amount of a compound showing an ESR spectrum at room temperature, said compound being either an oxide or salt having a crystal lattice of cubic symmetry doped with such a metal, or an oxide or salt of arbitrary symmetry doped with a freely rotatable ion containing such a metal.
Claims10
A method of checking the authenticity of papers in a physical way which comprises using authentic paper containing a minor amount of a substance showing an electron spin resonance spectrum at room temperature, and checking the authenticity by electron spin resonance spectroscopy.
Dependencies are inferred from the claim text.