Signs
AssigneeSaf-T-Glo Limited
InventorSean Patrick O'Kell
Life of this patent
Estimating the term…
Abstract
A sign has a sign plate mounted in a frame to display an image such as the word “EXIT” when illuminated. The sign includes an electrically powered light source configured for edge lighting of the sign. The sign plate has a front portion, a rear portion and an intermediate portion between the front and rear portions. The rear portion provides a photoluminescent light source for back lighting the sign. The sign is edge lit when the electrically powered light source is in use and is backlit by the photoluminescent light source in darkness or low ambient light conditions when the electrically powered light source is not in use.
Claims20
A sign configured to display an image when illuminated, the sign including an electrically powered light source configured for edge lighting of the sign and a photoluminescent light source configured for back lighting of the sign, wherein the sign has a front portion, a rear portion and an intermediate portion between the front and rear portions, and wherein the rear portion includes the photoluminescent light source, the arrangement being such that the sign is edge lit when the electrically powered light source is in use and is backlit by the photoluminescent light source in darkness or low ambient light conditions when the electrically powered light source is not in use.
Dependencies are inferred from the claim text.