Method of making colored photochromic glasses

Details Method of making colored photochromic glasses Method of making colored photochromic glasses

1979-11-19

1981-09-22

Kellogg, Arthur D.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 31, 65 33, 501 61, 501 62, C03C 320

Patent

active

042907942

ABSTRACT:
The instant invention is concerned with a method for producing shades of a tint in a photochromic glass, the hue of which will be essentially permanent even after subjecting the glass to temperatures up to about the strain point of the glass. Silver halide crystals constitute the photochromic agents, the glass contains lead, and the method contemplates exposing such a glass to a gaseous reducing atmosphere at temperatures above the strain point of the glass to cause the reduction of silver ions to metallic silver and the reduction of lead ions to metallic lead which coats or alloys with the metallic silver.

REFERENCES:
patent: 3892582 (1975-07-01), Simms
patent: 4036624 (1977-07-01), Krohn et al.
patent: 4043781 (1977-08-01), DeMunn et al.

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