Optical glass having n.sub.D =1.63.+-.(1.5.times.10.sup.-2), v.sub.D =59.5.+-.1.0 with a high chemical stability and a low tendency to crystallization
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United States of America Patent
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Aug 10, 1982
Grant Date -
N/A
app pub date -
Dec 29, 1980
filing date -
Dec 29, 1979
priority date (Note) -
Expired
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Abstract
An optical glass having n.sub.D =1.63.+-.(1.5.times.10.sup.-2), v.sub.D =59.5.+-.1.0, a high chemical stability and a low tendency to crystallization is provided, consisting essentially of (in percent. by weight):
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