Patent ID: 8703281

Claim:
A coated article including a layer system supported by a glass substrate, the layer system comprising: a first dielectric layer comprising silicon nitride; a first layer comprising NbZr on the glass substrate over at least the first dielectric layer; a second dielectric layer comprising silicon nitride on the glass substrate over at least the first dielectric layer and the first layer comprising NbZr; a second layer comprising NbZr on the glass substrate over at least the second dielectric layer; a third dielectric layer comprising silicon nitride on the glass substrate over at least the second layer comprising NbZr; wherein the second dielectric layer comprising silicon nitride is located directly between and contacting the first and second layers comprising NbZr; wherein the second layer comprising NbZr is an infrared (IR) reflecting layer and is at least twice as thick as the first layer comprising NbZr, and wherein the second dielectric layer comprising silicon nitride is located between the first and second layers comprising NbZr; and wherein the coated article has no infrared (IR) reflecting layer based on any of Ag or Au.