05365411 is referenced by 142 patents and cites 46 patents.

A light unit for use in lighted sign assemblies has a housing with a rear wall, upstanding opposed side walls, and shield elements extending inwardly from adjacent the upper ends of the side walls. Light arrays extending along the side walls have light emitting diodes disposed in spaced relationship above the rear wall and below the shield elements, and a diffuser extends across the housing above the shield elements. The rear wall is configured to reflect light emitted from the diodes relatively uniformly across the diffuser which further contributes to relative uniform transmission of light therethrough. The power supply may include a circuit to transform alternating current line voltage into a reduced direct current voltage for the diodes, and the power supply may also provide direct current to the diodes from a battery power source when power is interrupted.

Title
Exit signs with LED illumination
Application Number
8/1393
Publication Number
5365411
Application Date
January 6, 1993
Publication Date
November 15, 1994
Inventor
Abi F Madadi
Scarborough
CA
David J Rycroft
Unionville
CA
Assignee
Kaufel Group
CA
IPC
G09F 13/18
F21V 19/04
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