Glasses with a high refractive index and their use as segments of multifocal corrective lenses
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United States of America Patent
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Apr 4, 2000
Grant Date -
N/A
app pub date -
Sep 22, 1998
filing date -
Apr 2, 1996
priority date (Note) -
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Abstract
The invention concerns glasses characterized by the fact that they have a refractive index higher than 1.740; a dilatation coefficient .alpha., between 25 and 300.degree. C., between 65 and 70.times.10.sup.-7 /.degree.C.; and a Littleton point not exceeding 635.degree. C. but higher than 600.degree. C.; they have the following composition, expressed in weight percent of oxides:
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