Phosphorescent marking system

Details Phosphorescent marking system Phosphorescent marking system

1985-06-13

1986-05-20

Kittle, John E.

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

2504851, 430139, H05B 3300, H05B 3310, G01J 158, G01N 2164

Patent

active

045903816

ABSTRACT:
A device of phosphorescent material on which luminescent images are formed and retained for a period of time is disclosed. The device includes phosphorescent material in the form of a sheet mounted on a support. The support exposes the top surface of the phosphorescent material to activating light. A shield maintains deactivation of the phosphorescent material. Upon removal of the shield in a dark area, the phosphorescent material may be activated in selected areas to form an image which is retained for a period of time until the phosphorescent material has decayed to an inactivated state of imperceptible level of luminescence. This type of device is particularly suited to amusement and educational items for children. However, it is also useful in industrial applications where writing and communication of information in the dark is necessary.

REFERENCES:
patent: 3205071 (1965-09-01), Finnis
patent: 3631243 (1971-12-01), Byler et al.
patent: 3725694 (1973-04-01), D'Amato et al.
patent: 4179614 (1979-12-01), Felice et al.
patent: 4220852 (1980-09-01), Seidel

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