Patent ID: 8586215
Filing Date: 2013-11-19
Classification: C03C,C23C,E06B,G02B,Y02B,Y10T

Abstract:
1. A coated transparent pane having opposed first and second major surfaces, said coated pane being part of a multiple-pane insulating glazing unit that includes a second pane, wherein the insulating glazing unit has a between-pane space to which the second major surface of said coated pane is exposed, the second major surface bearing a low-emissivity coating that includes the following film regions in sequence moving away from said second major surface: a first transparent dielectric film region, a first infrared-reflection film region, a second transparent dielectric film region, a second infrared-reflection film region, a third transparent dielectric film region, a third infrared-reflection film region, and a fourth transparent dielectric film region, the second infrared-reflection film region being thicker than the first infrared-reflection film region by at least 10 angstroms, and the third infrared-reflection film region being thicker than the second infrared-reflection film region by at least 25 angstroms, said three infrared-reflection film regions being silver-containing layers each having a thickness of between about 50 angstroms and about 300 angstroms, each of said four transparent dielectric film regions having a thickness of between about 100 angstroms and about 800 angstroms, and wherein each of said four transparent dielectric film regions comprises an uppermost zinc tin oxide layer with the remainder of the film in the transparent dielectric film region having a refractive index higher than that of the zinc tin oxide, each of said uppermost zinc tin oxide layers having a tin content of less than 0.30 on a metal-only weight basis.