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US 8,250,794 B2Granted
Emergency information sign
AssigneeAvery Dennison Corporation
InventorMichael E. Hannington
Life of this patent
Estimating the term…
Abstract
An emergency information sign (10) comprising a base substrate (12) and an indicia layer (14) positioned over the base substrate (12). Exposed areas (24) of the base substrate (12) and covering areas (26) of the indicia layer (14) together form emergency information indicia. The base substrate (12) and the indicia layer (14) each carry phosphorescent materials (20, 22), which absorb and store light from a primary light source (16/18) and emit this stored light during dark conditions.
Claims13
An emergency information sign comprising a base substrate and an indicia layer positioned over the base substrate;
- wherein the base substrate has areas which are exposed and the indicia layer has areas which cover the base substrate, these areas together forming emergency information indicia;
- wherein the base substrate and the indicia layer each carry phosphorescent materials which absorb and store light from a primary light source and emit this stored light during dark conditions;
- and
- the base substrate has an optical transmittance less than that of the indicia layer, and wherein primary light from the primary light source passes through the indicia layer to the base substrate.
1 more element
Dependencies are inferred from the claim text.