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US 4,016,450 AGranted
Phosphorescent display system
OwnerGarbis S. Balekjianinventor
Life of this patent
Estimating the term…
Abstract
A sign having phosphorescent indicia, a light source providing ultraviolet radiation for illuminating the sign and charging the phosphorescent indicia, and a photoelectric sensor responsive to the level of the phosphorescent glow of the indicia for briefly energizing or flashing the light source whereby to effectively recharge the phosphor when the light level of the glow decays below a predetermined value.
Claims7
A phosphorescent display system comprising:
- a phosphor material;
- a source of activating radiation in operative relation with said material;
- a power supply for energizing said source;
- selectively actuatable control means for momentarily operatively connecting the power supply to said source;
- and sensor means responsive to the luminosity of the phosphor material for actuating the control means.
2 more elements
Dependencies are inferred from the claim text.