Glass for multi-focal eyeglass lens

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

1984-10-26

1985-12-31

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 61, 501 62, 501 74, 501 75, 501 76, 501903, C03C 3102, C03C 307, C03C 3072, C03C 400

Patent

active

045621624

ABSTRACT:
A glass for multi-focal eyeglass having a refractive index (n.sub.d) of 1.67 to 1.73, an Abbe number (.nu..sub.d) of 33 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: 4351906 (1982-09-01), Boudot et al.

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