Very fast fading photochromic glass

Details Very fast fading photochromic glass Very fast fading photochromic glass

1982-09-16

1983-10-04

Bell, Mark

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 56, 501 61, 501 67, C03C 326, C03C 308

Patent

active

044079664

ABSTRACT:
The present invention is directed to the preparation of photochromic glasses exhibiting a darkened luminous transmittance at 40.degree. C. below 35% and a five-minute fading rate at 40.degree. C. of at least 40 units of transmittance and a darkened transmittance at 25.degree. C. below 25% and a five-minute fading rate at 25.degree. C. of at least 35 units of transmittance. The glasses consist essentially, by weight, of:

REFERENCES:
patent: 3208860 (1965-09-01), Armistead et al.
patent: 4018965 (1977-04-01), Kerko et al.
patent: 4043781 (1977-08-01), De Munn et al.
patent: 4130437 (1978-12-01), Mazeau et al.
patent: 4168339 (1979-09-01), Kerko et al.
patent: 4190451 (1980-02-01), Hares et al.
patent: 4290813 (1981-09-01), Owen et al.
patent: 4358542 (1982-11-01), Hares et al.

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