Patent ID: 6058738
Filing Date: 2000-05-09
Classification: C03C,G02B

Abstract:
In a method of forming glass having polarizing and non-polarizing regions integral thereto, by:a) providing a phase-separable, copper and silver-containing glass, said glass being phase separable by virtue of the presence therein of silver-halide particles;b) elongating the glass under stress such that the particles are elongated and aligned in the direction of the stress;c) applying a protective material to the surface of the glass to form a pattern of protected and unprotected regions;d) subjecting the glass to a reducing gas atmosphere to reduce the reducible phase in the unprotected regions of the glass and thereby render the glass in said regions polarizing; and(e) removing the protective material from the glass to reveal underlying non-polarizing glass;the improvement being that the protective material is applied in the form of a glass/frit mixture, wherein said material is capable of blocking a reducing gas.