Patent ID: 8003167

Claim:
A method of making a heat treated coated article, the method comprising: providing a glass substrate; forming at least a layer comprising carbon on the glass substrate; forming a protective film on the glass substrate over at least the layer comprising carbon, the protective film including a layer comprising SnO x , where x is from about 0.75 to 1.5, and a layer comprising substoichiometric zinc oxide ZnO t where t is from 0.1 to 0.8, wherein in the protective film the layer comprising zinc oxide ZnO t is located between and contacting the layer comprising carbon and the layer comprising SnO x ; heat treating the glass substrate with the layer comprising carbon and the protective film thereon so that during the heat treating the protective film prevents significant burnoff of the layer comprising carbon, wherein the heat treating comprises heating the glass substrate to temperature(s) sufficient for thermal tempering, heat strengthening, and/or heat bending; wherein during the heat treating the layer comprising SnO x transforms into a layer comprising SnO y , where y is from about 1.6 to 2.2, wherein y is greater than x; and exposing the protective film to a release liquid and removing at least part of the protective film after said heat treating.