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

1987-07-16

1989-05-23

Pellinen, A. D.

Registers

Records

Fluorescent, phosphorescent, radiation emitting

252 6257, 356 71, 428199, 428323, 428333, 428689, 428690, 428913, 428916, 428917, B32B 2300

Patent

active

048333115

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: 3473027 (1969-10-01), Freeman et al.
patent: 3800142 (1974-03-01), Harshaw
patent: 4451521 (1984-05-01), Kaule et al.
patent: 4451530 (1984-05-01), Kaule et al.
Poluektov et al., "Quenching of the Europium Luminescence in Crystals of Intracomplex Compounds in the Presence of Other Rare Earths, Optics and Spectroscopy", Optical Society of America, vol. XVII, No. 1, Jul. 1964.
Search Resport for French Pat. Appln. No. 86-11,878, dated May 29, 1987.

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