Compatible near-portion phototropic glass

Details Compatible near-portion phototropic glass Compatible near-portion phototropic glass

1976-04-27

1976-12-28

Douglas, Winston A.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 47Q, C03C 308, C03C 310

Patent

active

039999963

ABSTRACT:
Glass as near-portion material for fusion with known phototropic far-portion glasses for multifocal spectacle lenses has a linear thermal expansion coefficient between 45 and 58 .times. 10.sup.-.sup.7 /.degree. C, a refractive index of n.sub.d .gtoreq.1.60, a speed of crystallization of less than 0.5 .mu./min., and the following composition:

REFERENCES:
patent: 3653933 (1972-04-01), Tsunekawa
patent: 3765913 (1973-10-01), Murahaim et al.
patent: 3801336 (1974-04-01), Upton
patent: 3915723 (1975-10-01), Upton

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