Patent ID: 7846549

Claim:
A coated transparent substrate which carries a coating stack, the coating stack being in direct contact with the transparent substrate and the coating stack including: at least one metallic coating layer including silver or a silver alloy; two non-absorbent transparent dielectric coating layers in contact with each metallic coating layer, wherein each dielectric coating layer in the coating stack includes a sub-layer based on a partially but not totally oxidized combination of at least two metals, wherein a dielectric coating layer between the substrate and a metallic coating layer closest to the substrate includes a first sub-layer of an oxide of a metal selected from Ti, Ta, Nb and Sn in contact with the metallic coating layer closest to the substrate, and a second sub-layer based on a partially but not totally oxidized combination of at least two metals that is in direct contact with the first sub-layer and is not in direct contact with the metallic coating layer closest to the substrate, wherein the coated substrate has not been subjected to bending or tempering heat treatment, and wherein the coated substrate is adapted to withstand a bending or tempering heat treatment.