Patent ID: 6656522
Filing Date: 2003-12-02
Classification: C03C,C23C,G02B,Y10T

Abstract:
A method for making a heat treated antireflective coated inorganic substrate comprising:(a) coating an inorganic substrate with an inner layer comprising a mixture of at least one first oxide of a metal selected from the group consisting of titanium, zirconium, lanthanum, tantalum, and niobium and at least one second oxide of a metal selected from the group consisting of silicon and aluminum to form an inner layer; (b) coating the inner layer with a middle layer comprising an oxide of zirconium; (c) coating the middle layer with an outer layer of at least one oxide of a metal selected from the group consisting of silicon and aluminum; and (d) heat treating the coated inorganic substrate wherein said heat treatment comprises tempering.