C CHEMISTRY; METALLURGY
C03 GLASS; MINERAL OR SLAG WOOL
C03C CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
17/00 Surface treatment of glass, not in the form of fibres or filaments, by coating
C03C17/34 with at least two coatings having different compositions
C03C17/3411 with at least two coatings of inorganic materials
C03C17/3429 at least one of the coatings being a non-oxide coating
C03C17/3464 comprising a chalcogenide
C03C17/347 comprising a sulfide or oxysulfide