Fast fading photochromic glass

Details Fast fading photochromic glass Fast fading photochromic glass

1986-02-10

1988-05-24

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 56, C03C 406, C03C 311

Patent

active

047466332

ABSTRACT:
This invention is directed to transparent photochromic glasses that can darken to a comfort range, i.e., between about 35-60%, or to a dark range, i.e., below 35%, depending upon glass composition, and will exhibit a faded transmittance after five minutes' removal from actinic radiation higher than 70%. The base compositions of the glasses consist essentially, in weight percent, of about

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