Composite photochromic glass article and method of making
First Claim
1. A composite photochromic glass article comprising a core portion and a thin surface layer substantially encasing that core portion, one of said core portion and encasing layer being composed of a first glass containing a copper-cadmium halide photochromic phase in a surface layer thereof, and the other of said component parts being composed of a second glass that has a copper-cadmium-silver halide photochromic phase developed therein, the depth of photochromic development in the article being not over about ten mils and exhibiting, in the darkened state, a color intermediate the characteristic red and green of the component glasses.
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Accused Products
Abstract
There is disclosed a composite photochromic glass article composed of a glass core and a thin surface layer substantially encasing that core, the core preferably containing a copper-cadmium halide photochromic crystal system and the substantially encasing glass layer preferably containing a copper-cadmium-silver halide photochromic crystal system. The article may be made by fusion laminating two separately formed glasses, or by introducing silver into a surface layer on a glass article by ion exchange.
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Citations
12 Claims
- 1. A composite photochromic glass article comprising a core portion and a thin surface layer substantially encasing that core portion, one of said core portion and encasing layer being composed of a first glass containing a copper-cadmium halide photochromic phase in a surface layer thereof, and the other of said component parts being composed of a second glass that has a copper-cadmium-silver halide photochromic phase developed therein, the depth of photochromic development in the article being not over about ten mils and exhibiting, in the darkened state, a color intermediate the characteristic red and green of the component glasses.
Specification