US Patent 7736746 Glazing

A glazing suitable for undergoing a thermal treatment such as toughening or bending, comprising a multilayered coating deposited on a glass sheet, and also to a toughened and/or bent glazing and a multiple glazing comprising such a toughened and/or bent glazing. The multilayered coating includes:a) a zinc-tin mixed oxide containing at least 12% tin,b) a first silver-based infrared reflecting layer,d) a dielectric,e) a second silver-based infrared reflecting layer,g) a zinc-tin mixed oxide containing at least 12% tin,h) an upper protective layer based on the nitride or oxynitride of Ti, Zr, Hf, V, Nb, Ta, Cr, alloys thereof, or based on the nitride or oxynitride of the alloy or one or more of these metals with Al and/or B.