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
2217/00 Coatings on glass
C03C2217/70 Properties of coatings
C03C2217/73 Anti-reflective coatings with specific characteristics
C03C2217/734 comprising an alternation of high and low refractive indexes