Shielded fluorescent signs

Details Shielded fluorescent signs Shielded fluorescent signs

1981-07-29

1984-01-03

Howell, Janice A.

Radiant energy

Luminophor irradiation

With ultraviolet source

40542, G01N 2164, G09F 1320

Patent

active

044244495

ABSTRACT:
A sign includes fluorescent pigment-containing indicia protected from fading from solar ultraviolet radiation by a transparent, ultraviolet-absorbing shield spaced apart therefrom. An artificial source of ultraviolet radiation is interposed between the indicia and the shield, and permits excitation of the fluorescence for nightime use of the sign.

REFERENCES:
patent: 3525864 (1970-08-01), Leach
patent: 4016450 (1977-04-01), Balekjian

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