Patent ID: 6926967

Claim:
A heat treated coated article comprising: a layer system supported by a glass substrate, said layer system comprising a layer comprising metal nitride located between at least first and second dielectric layers, wherein the second dielectric layer is at least partially nitrided and positioned so that the layer comprising metal nitride is between the second dielectric layer and the glass substrate; wherein the layer comprising the metal nitride is the primary infrared (IR) reflecting layer of the layer system; wherein said coated article has a glass side reflective ΔE* G value no greater than 4.0 after heat treatment; and wherein said coated article is chemically durable in that the coated article before and/or after heat treatment shows no visible discoloration and no visible peeling after a reference of a one hour boil of a sample of the coated article in 5% HCl solution at about 220 degrees F.