High index brown photochromic glasses

Details High index brown photochromic glasses High index brown photochromic glasses

1994-08-15

1995-06-20

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 65, 501 67, 501 72, C03C 406

Patent

active

054260779

ABSTRACT:
This invention is directed to photochromic glasses which darken to a brown coloration upon exposure to actinic radiation, which glasses have a refractive index of about 1.6, an Abbe number between 42-47, a density less than 2.82 g/cm.sup.3, and are preferably essentially free of TiO.sub.2. The glass compositions consist generally, in weight percent, of:

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