Registers – Records – Fluorescent – phosphorescent – radiation emitting
Patent
1989-03-20
1990-01-02
Reynolds, B. A.
Registers
Records
Fluorescent, phosphorescent, radiation emitting
283 92, 252 6257, 356 71, 428199, 428689, 428690, B32B 2300
Patent
active
048915050
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
patent: 3800142 (1974-03-01), Harshaw
patent: 4451521 (1984-05-01), Kaule
patent: 4451530 (1984-05-01), Kaule
Fuller Leon K.
Petrel
Reynolds B. A.
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