Sign letter structure

Abstract From the Canadian patent

A sign letter structure for use in an illuminated sign and a composite extruded thermoplastic strip conforming to the periphery of a generally flat letter-form making up the sign the, extruded strip having parallel longitudinally extending spaced opaque sections with a transparent thermoplastic section therebetween, the perimetrical edging of the strip extending inwardly of the frame with the front surface of the edge in contact with the front surface of the letter-form, the transparent section having a convex outer surface and a ridged inner surface for picking up light rays and for diffusing such light rays after they have passed through the transparent section.