Glass for multi-focal eyeglass lens

Details Glass for multi-focal eyeglass lens Glass for multi-focal eyeglass lens

1984-10-26

1986-02-04

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 76, 501903, C03C 3072, C03C 3074, C03C 400

Patent

active

045686513

ABSTRACT:
A glass for multi-focal eyeglass having a refractive index (n.sub.d) of 1.74 to 1.78, an Abbe number (.nu..sub.d) of 31 or more, a coefficient of thermal expansion of 82 to 95.times.10.sup.-7 and a softening point of 560.degree. to 640.degree. C., comprising, in % by weight,

REFERENCES:
patent: 4128432 (1978-12-01), Komorita et al.

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