Patent ID: 7122252
Filing Date: 2006-10-17
Classification: C03C,E06B

Abstract:
1. A transparent substrate bearing a high shading performance, low-emissivity coating comprising, in sequence outwardly: (a) a first infrared-reflective film having a thickness of between about 76 Å and about 122 Å; (b) a first high absorption blocker layer positioned directly over the first infrared-reflective film, the first high absorption blocker layer comprising a metallic film selected from the group consisting of niobium, titanium, and niobium-titanium, wherein the first high absorption blocker layer has a thickness of between about 38 Å and about 69 Å; (c) a second infrared-reflective film having a thickness of between about 119 Å and about 184 Å; and (d) a second high absorption blocker layer positioned directly over the second infrared-reflective film, the second high absorption blocker layer comprising a metallic film selected from the group consisting of niobium, titanium, niobium-titanium, wherein the second high absorption blocker layer has a thickness of between about 29 Å and about 63 Å, wherein the first and second high absorption blocker layers have a combined thickness of at least 70 Å, the coating comprising an inner coat between the substrate and the first infrared-reflective film, the inner coat having an optical thickness and comprising at least one transparent dielectric film, the coating comprising a middle coat between the first high absorption blocker layer and the second infrared-reflective film, the middle coat having an optical thickness and comprising at least one transparent dielectric film, wherein the coating has a ratio defined as the optical thickness of the inner coat divided by the optical thickness of the middle coat, said ratio being between about 0.12 and about 0.2.