Light emitting diode signs and translucent plastic sheets...

Details Light emitting diode signs and translucent plastic sheets... Light emitting diode signs and translucent plastic sheets...

2005-04-12

2005-04-12

Garrett, Dawn (Department: 1774)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

C428S212000, C428S332000, C428S327000, C428S690000, C428S917000, C313S506000, C313S510000

Reexamination Certificate

active

06878436

ABSTRACT:
Disclosed is a polished translucent co-extruded sheet having utility as a light diffusing protective cover or sign face for light emitting diode (LED) light sources and other purposes. The sheet is comprised of (a) a particle layer containing particles having a mean particle size of about 4 to 100 microns and having a particle size distribution of between 1-110 microns, at a loading of 1 to 60% melt blended with a thermoplastic matrix, wherein the particle and matrix have refractive indices that differ by greater than 0.001 units of each other when measured in conformance with ASTM D 542; and (b) at least one substrate layer comprised of thermoplastic compositions, wherein the substrates have a refractive index within 0.2 units of the refractive index of the particle layer matrix when measured in conformance with ASTM D 542.

REFERENCES:
patent: 5705580 (1998-01-01), Giberti
patent: 20020027626 (2002-03-01), Hiraishi et al.
patent: 0497506 (1992-08-01), None
patent: 0683182 (1995-05-01), None
patent: 0774471 (1996-11-01), None

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