Phototropic glass for multifocal spectacle-glasses

Details Phototropic glass for multifocal spectacle-glasses Phototropic glass for multifocal spectacle-glasses

1978-06-28

1979-04-17

Vertiz, O. R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106DIG6, C03C 326, C03C 310

Patent

active

041498968

ABSTRACT:
Glasses are provided which may be made phototropic and which have a thermal coefficient of linear expansion between about 43 and 58.times.10.sup.-7 /.degree. C. and an index of refraction n.sub.d over about 1.60. Such glasses can be employed as near portion glass material in spectacle lens manufacture; thus, such glasses can be fused with known phototropic for portion glass material, for example, of the borosilicate type, to make multifocal glasses useful in spectacle lenses and spectacles.

REFERENCES:
patent: 3765913 (1973-10-01), Murakami et al.

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