Patent ID: 6942923

Claim:
A coated article including a coating supported by a glass substrate, the coating comprising: first and second infrared (IR) reflecting layers comprising silver (Ag); a first dielectric layer having an index of refraction n<=3.0 provided between the first IR reflecting layer and the glass substrate; a second dielectric layer having an index of refraction 1.8<=n<2.2 provided between the first and second IR reflecting layers, wherein the second dielectric layer has an index of refraction n less than the index of refraction n of the first dielectric layer; a third dielectric layer comprising silicon oxynitride provided over the first and second IR reflecting layers, said third dielectric layer comprising silicon oxynitride having an index of refraction n less than the index of refraction n of the second dielectric layer; wherein the coated article has a visible transmission of at least 70 %; and wherein each of the first and second IR reflecting layers comprising Ag is sandwiched between and contacts a pair of contact layers, and wherein at least one of the contact layers adjacent each IR reflecting layer comprises at least one of NiCr, NiCrO x , and NiCrN x , at least one of the contact layers comprises Ni and Cr.