Method of making photochromic glasses suitable for simultaneous

Details Method of making photochromic glasses suitable for simultaneous Method of making photochromic glasses suitable for simultaneous

1979-10-26

1981-08-04

Kellogg, Arthur D.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 37, 65DIG2, 106 47Q, 106 53, C03C 326

Patent

active

042820219

ABSTRACT:
The instant invention is related to the manufacture of photochromic glasses having base compositions within a very narrow interval of the alkali metal boroaluminosilicate system wherein silver chloride and/or silver bromide crystals impart photochromic properties. The glasses are notable for their rapid fading characteristics and relatively low temperature dependence of darkening. The compositions are especially suitable for a production process which contemplates simultaneously shaping articles from glass sheet and developing photochromic properties therein.

REFERENCES:
patent: 3338696 (1967-08-01), Dockerty
patent: 4018965 (1977-04-01), Kerko et al.
patent: 4088470 (1978-05-01), Bourg et al.

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