High refractive index photochromic glasses

Details High refractive index photochromic glasses High refractive index photochromic glasses

1989-05-10

1990-12-25

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 56, 501 58, 501 59, 501 77, 501 78, 501 79, C03C 406, C03C 311, C03C 3115, C03C 3064

Patent

active

049803182

ABSTRACT:
This invention relates to photochromic glasses exhibiting refractive indices greater than 1.59, densities no higher than 3.1 g/cm.sup.3, Abbe numbers of at least 40, weight losses no greater than 0.01 mg/cm.sup.2 in the A.O. test, and which, when exposed to actinic radiation at room temperatures, darken to transmittances below 40% and fade at least 15 percentage points of transmittance after five minutes' removal from the actinic radiation.

REFERENCES:
patent: 3998647 (1976-12-01), Yamashita et al.
patent: 4102693 (1978-07-01), Owen et al.
patent: 4190451 (1980-02-01), Hares et al.
patent: 4746633 (1988-05-01), Mazeau et al.

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