Method of coating glass

Abstract

In methods of forming a coating comprising a pyrolytically formed oxide layer on a travelling hot glass substrate, the substrate is contacted with coating precursor material in the presence of oxygen. In order to prevent interaction between the glass of the substrate and the coating precursor material used for applying an upper coating stratum, and/or to facilitate modification of the optical or other properties of the coating as a whole, an oxide substratum of said coating ("the undercoating layer") is pyrolytically formed in an incompletely oxidized state by contacting the substrate in an undercoating chamber with undercoat precursor material in the presence of oxygen in insufficient quantity for full oxidation of the undercoat material on the substrate and such undercoat is overcoated with an upper coating layer while it is still in an incompletely oxidized state, and while the substrate is still hot, thereby to preserve such undercoat in an incompletely oxidized state.

Dependencies are inferred from the claim text.