Method of checking the authenticity of papers and physically ide

Details Method of checking the authenticity of papers and physically ide Method of checking the authenticity of papers and physically ide

1981-02-04

1983-03-08

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using an electron resonance spectrometer system

324300, G01N 2700

Patent

active

043762646

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.

REFERENCES:
patent: 2951164 (1960-08-01), Timms
patent: 3348136 (1967-10-01), Nelson et al.
patent: 3358222 (1967-12-01), Hyde
patent: 3480785 (1969-11-01), Aufderheide
patent: 3491243 (1970-01-01), Tsugami
patent: 4267620 (1981-05-01), Allen, Jr.

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