Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device
Patent
1995-10-25
1997-09-09
Glick, Edward J.
Radiant energy
Invisible radiation responsive nonelectric signalling
Luminescent device
2504844, 3350105, 3350145, G01B 100, G01B 502, G01B 526
Patent
active
056659733
ABSTRACT:
A plurality of transparent members are provided each of which has an elongated flat portion with a tip portion at one end forming an obtuse angle relative to the elongated flat portion with the tip portion having a narrowed end, and a spot of material located on the tip portion that fluoresces in the presence of blacklight. The spots of the plurality of transparent members are of different sizes respectively. Also provided is a flat transparent member having a series of spaced apart lines of different lengths with dimension numbers formed next to the lines respectively. The lines and numbers fluoresce in the presence of blacklight. The plurality of transparent members and the flat transparent member are coupled together for movement relative to each other.
REFERENCES:
patent: 2767478 (1956-10-01), Adams
patent: 3950642 (1976-04-01), Feld
patent: 5471757 (1995-12-01), McDonald
Glick Edward J.
Lockheed Corporation
Zobal Arthur F.
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