Patent ID: 7572510
Filing Date: 2009-08-11
Classification: C03C,C23C,Y10T

Abstract:
1. A coated substrate having a major surface bearing a low-emissivity coating, the coating comprising, from said major surface outwardly: a) a first transparent dielectric film region; b) a first infrared-reflection film region comprising silver; c) a second transparent dielectric film region; d) a second infrared-reflection film region comprising silver; e) a third transparent dielectric film region; f) a third infrared-reflection film region comprising silver; g) a fourth transparent dielectric film region; wherein the coated substrate is part of a multiple-pane insulating glazing unit that includes another substrate, both substrates being clear glass, wherein the first, second, and third infrared-reflection film regions have a combined thickness of between 420 Å-575 Å, the coating has an emissivity of less than 0.025, and yet said glazing unit has a total visible transmission of greater than 60%, wherein the coated substrate has a spectral transmission curve with a transmission peak that is located within a visible wavelength range, and wherein said spectral transmission curve has a halfwidth of less than 290 nm, the coating having a first reflection-region ratio defined as the thickness of the first infrared-reflective film region divided by the thickness of the second infrared-reflective film region, the coating having a second reflection-region ratio defined as the thickness of the second infrared-reflective film region divided by the thickness of the third infrared-reflective film region, both the first and second reflection-region ratios being less than 0.83, and at least one of the first and second reflection-region ratios being less than 0.80.