Optical colored and filter glass
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United States of America Patent
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Oct 27, 1981
Grant Date -
N/A
app pub date -
Jun 16, 1980
filing date -
Jul 3, 1979
priority date (Note) -
Expired
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Abstract
Low alkali, high phosphate and high Al.sub.2 O.sub.3 content glasses are described which are highly suitable for optical colored and filter glasses. They exhibit a glass transformation temperature Tg>450.degree. C. and have the following composition, in percent by weight:
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