Marker

Details Marker Marker

1997-08-19

1999-05-04

Silbermann, Joanne

Card, picture, or sign exhibiting

Illuminated sign

Luminescent

40570, B32B 308, G08B 700

Patent

active

058990097

ABSTRACT:
A marker suitable for use under conditions of sudden darkness comprising at least one phosphorescent indicium which provides a relatively high level of illumination for a relatively short period of time following exposure to light, sufficient to permit a person's eyes to adjust to darkness and at least one tritium illuminated indicium providing a relatively low level of illumination for a relatively long duration, which level of illumination is sufficient so as to be seen by a person once the person's eyes have adjusted to darkness.

REFERENCES:
patent: 3262224 (1966-07-01), Hardesty
patent: 3478209 (1969-11-01), Feuer
patent: 3578973 (1971-05-01), Dooley et al.
patent: 3724202 (1973-04-01), Feller
patent: 4016450 (1977-04-01), Balekjian
patent: 4383382 (1983-05-01), Hegarty
patent: 4677008 (1987-06-01), Webb
patent: 4889660 (1989-12-01), Jensen et al.
patent: 4928414 (1990-05-01), Bright
patent: 5165781 (1992-11-01), Orak
patent: 5323492 (1994-06-01), DeMars

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