Patent ID: 8197940

Claim:
In a coated article of the type having a first outer surface and an opposite second outer surface, a glass substrate comprising a first surface and an opposite second surface, and a sprayed pyrolytic transparent film over the first surface of the glass substrate, the film having a first surface and an opposite second surface, wherein the second surface of the film is over the first surface of the glass substrate and the first surface of the film is the first outer surface of the coated article, wherein the film is a mixed metal oxide film comprising oxides of iron, chromium and cobalt, the film having a crystal structure, wherein size of the crystals of the crystal structure is obtained by spraying the first surface of the glass substrate heated to a temperature of 1100° Fahrenheit (F) (593° Centigrade (C)) with an aqueous suspension of cobalt acetylacetonate (“CO AcAc”), iron acetylacetonate (“Fe AcAc”) and chromium acetylacetonate (“Cr AcAc”), wherein particle size of the Co AcAc, Fe AcAc and Cr AcAc in the suspension have a same mean value, the improvement comprising: crystals of the crystal structure of the film have a size in the range of 15 to 20 nanometers, wherein the size of the crystals of the crystal structure is obtained by spraying the first surface of the glass substrate heated to a temperature of 1100° Fahrenheit (F) (593° Centigrade) with an aqueous suspension of Co AcAc, Fe AcAc and Cr AcAc, wherein the particle size of the Co AcAc and of the Cr AcAc in the suspension have a lower mean value than the mean value of the particle size of the Fe AcAc in the suspension.