Silver-free polarizing photochromic glasses

Details Silver-free polarizing photochromic glasses Silver-free polarizing photochromic glasses

1974-09-16

1976-05-04

Douglas, Winston A.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106DIG6, 106 54, 65 33, C03C 300

Patent

active

039544850

ABSTRACT:
Silver-free photochromic glasses capable of reversibly changing from the clear nonpolarizing state to the darkened polarizing state are provided by heating a photochromic alkali boroaluminosilicate base glass containing copper and/or cadmium halides to a working temperature and elongating the glass to modify the photochromic particles therein.

REFERENCES:
patent: 2319816 (1943-05-01), Land
patent: 3208860 (1965-09-01), Armistead
patent: 3325299 (1967-06-01), Araujo
patent: 3328182 (1967-06-01), Araujo
patent: 3540793 (1970-11-01), Araujo

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