Phototropic glass for multifocal spectacle-glasses

Glasses are provided which may be made phototropic and which have a thermal coefficient of linear expansion between about 43 and 58x10-7/ DEG C. and an index of refraction nd over about 1.60. Such glasses can be employed as near portion glass material in spectacle lens manufacture; thus, such glasse...

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Bibliographische Detailangaben
Hauptverfasser:	GLIEMEROTH, GEORG, FAULSTICH, MARGA
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY CONTACT LENSES GLASS JOINING GLASS TO GLASS OR OTHER MATERIALS METALLURGY MINERAL OR SLAG WOOL OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHYSICS SPECTACLES SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS
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Beschreibung
Zusammenfassung:	Glasses are provided which may be made phototropic and which have a thermal coefficient of linear expansion between about 43 and 58x10-7/ DEG C. and an index of refraction nd 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.