Method for making a brown photochromic glass

Details Method for making a brown photochromic glass Method for making a brown photochromic glass

1976-05-24

1977-08-23

Bashore, S. Leon

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 33, 65117, 65DIG2, 106DIG6, 106 53, 106 54, 350160P, 350311, 351163, C03C 1500, C03B 3200, C03C 304, G02B 523

Patent

active

040437817

ABSTRACT:
A silver-halide photochromic glass of alkali-boroaluminosilicate base composition, having a brown coloration in the faded and darkened state, is provided by treating a potentially photochromic glass of specified composition according to a defined two-phase heat treatment to develop photochromic properties therein.

REFERENCES:
patent: 3795523 (1974-03-01), Moriya et al.
patent: 3892582 (1975-07-01), Simms
patent: 3920463 (1975-11-01), Simms
patent: 3938977 (1976-02-01), Gliemeroth
patent: 4001019 (1977-01-01), Yamashita et al.

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