Security markings, material provided with security marks, and ap

Details Security markings, material provided with security marks, and ap Security markings, material provided with security marks, and ap

1990-02-09

1992-06-02

Dixon, Jr., William R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 22, 106 20, 8648, 235491, 428690, C09D 1100

Patent

active

051183498

ABSTRACT:
The invention concerns a security-marking procedure, an apparatus to sense a security marking, fiduciary documents provided with security markings, by resorting to rare-earth chelates consisting of at least two rare-earths and of which the fluorescence wavelengths vary as functions of temperature, and fiduciary document containing such chelate(s).

REFERENCES:
patent: 2255696 (1941-09-01), George
patent: 3068063 (1962-12-01), Kiefer et al.
patent: 3473027 (1969-10-01), Freeman et al.
patent: 3800142 (1974-03-01), Harshaw, II
patent: 4442170 (1984-04-01), Kaule et al.
patent: 4451521 (1984-05-01), Kaule et al.
patent: 4655788 (1987-04-01), Jalon
patent: 4921280 (1990-05-01), Jalon

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