Patent ID: 7906203
Filing Date: 2011-03-15
Classification: C03C,C23C,E06B,G02B,Y02B,Y10T

Abstract:
1. A substrate having a major surface that bears a low-emissivity coating, the coating comprising a first infrared-reflection film region having a thickness, a second infrared-reflection film region having a thickness, and a third infrared-reflection film region having a thickness, where the thickness of the third infrared-reflection film region is greater than the thickness of the second infrared-reflection film region, and the thickness of the second infrared-reflection film region is greater than the thickness of the first infrared-reflection film region, the substrate being a glass pane that is part of a multiple-pane insulating glass unit including at least one other glass sheet, the coating comprising, from said major surface outwardly: a) a first transparent dielectric film region; b) the first infrared-reflection film region; c) a second transparent dielectric film region; d) the second infrared-reflection film region; e) a third transparent dielectric film region; f) the third infrared-reflection film region; g) a fourth transparent dielectric film region; wherein the first, second, and third infrared-reflection film regions each comprise silver, wherein the coating has a first reflection-region ratio equal to the thickness of the first infrared-reflection film region over the thickness of the second infrared-reflection film region, the coating has a second reflection-region ratio equal to the thickness of the second infrared-reflection film region over the thickness of the third infrared-reflection film region, both said first and second reflection-region ratios being less than 0.83, while at least one of said first and second reflection-region ratios is less than 0.80, the thickness of at least one of the three infrared-reflection film regions being greater than 175 angstroms, and the thicknesses of the three infrared-reflection film regions providing the coated substrate with a T