| abstract |
The invention is a heat reflecting transparent window cover having three layers. The composite has a substrate and a unique heat reflective stack disposed upon the substrate. The heat reflective stack has, in series, a first interference layer, an infrared reflecting metal layer, a second interference layer and a first non-infrared reflective layer. The first interference layer has an index of refraction which differs from the index of refraction of the substrate by at least about 0.1. The first non-infrared reflective layer is composed of the material from one of the following groups of materials: (i) metals having an index of refraction greater than about 1.0 and an extinction coefficient greater than about 2.0, and (ii) non-metals having an index of refraction greater than about 0.5 and an extinction coefficient greater than about 0.5. |