Patent ID: 7241506

Claim:
A substrate bearing a low-emissivity coating comprising, in sequence outwardly, a corrosion-resistant inner infrared-reflective layer having a thickness of between about 50 Å and about 150 Å, a transparent dielectric middle coat, and an outer infrared-reflective layer having a thickness of between about 90 Å and about 180 Å, wherein the outer infrared-reflective layer is thicker than the corrosion-resistant inner infrared-reflective layer, wherein the outer infrared-reflective layer consists essentially of silver and the corrosion-resistant inner infrared-reflective layer comprises either an electrically-conductive nitride or a corrosion-resistant silver alloy, wherein the corrosion-resistant silver alloy comprises silver and a durable metal, wherein the durable metal is a metal selected from the group consisting of platinum, palladium, nickel, indium, zinc, silicon, boron, beryllium, and titanium.