Patent ID: 9556070
Date: 2017-01-31
CPC Classifications: C03C,E06B,Y10T

Claim:
1. A coated article including a low-emissivity (low-E) coating on a substrate, the low-E coating comprising, moving away from the substrate: a dielectric layer; a dielectric layer comprising metal oxide; a first lower contact layer; a first IR reflecting layer comprising silver located over and directly contacting the first lower contact layer; a first upper contact layer comprising metal oxide located over and directly contacting the first IR reflecting layer comprising silver; a layer comprising zinc stannate located over and directly contacting the first upper contact layer comprising metal oxide; a layer consisting essentially of tin oxide located over and directly contacting the layer comprising zinc stannate; a second lower contact layer consisting essentially of zinc oxide, which may optionally be doped with aluminum, located over and directly contacting the layer consisting essentially of tin oxide; wherein a total thickness of the layer comprising zinc stannate and the layer consisting essentially of tin oxide is from 600-900 Å; a second IR reflecting layer comprising silver located over and directly contacting the second lower contact layer; a second upper contact layer located over and directly contacting the second IR reflecting layer comprising silver; and a dielectric layer; wherein the low-E coating has only two IR reflecting layers comprising silver, and wherein the low-E coating has a normal emissivity of no greater than 0 04; wherein a ratio of a thickness of the first IR reflecting layer comprising silver to a thickness of the second IR reflecting layer comprising silver, calculated as the thickness of the first IR reflecting layer comprising silver divided by the thickness of the second IR reflecting layer comprising silver, is from 0.30 to 0.50; and wherein the coated article, measured monolithically, has a visible transmission of at least about 70% and film side visible reflectance of no greater than 6.5%.