Patent ID: 7632571
Filing Date: 2009-12-15
Classification: C03C,C23C,Y10T

Abstract:
1. A sheet-like substrate having first and second generally-opposed major surfaces, at least one of the major surfaces bearing a low-emissivity coating, the coating comprising, in sequence, from the substrate outwardly: a) an inner dielectric layer; b) a first infrared-reflective layer; c) a middle coat comprising a first zinc tin oxide film region, a tin oxide film region, and a second zinc tin oxide film region, wherein said tin oxide film region is positioned between said first and second zinc tin oxide film regions and has a thickness of between about 5 angstroms and about 80 angstroms, and wherein said first zinc tin oxide film region is a graded film region that includes a substantially continuously increasing concentration of tin oxide and said second zinc tin oxide film region is a graded film region that includes a substantially continuously decreasing concentration of tin oxide; d) a second infrared-reflective layer; and e) an outer dielectric layer.