Optical glass
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United States of America Patent
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Jul 21, 2009
Grant Date -
May 11, 2006
app pub date -
Nov 8, 2005
filing date -
Nov 9, 2004
priority date (Note) -
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Abstract
is 17% by mass or less, a glass transition temperature (Tg) is 540° C. or less, and a weathering resistance (surface-method) in Class 1 or 2, and has excellent chemical durability, particularly weathering resistance (surface-method) and is appropriate for precision mold press forming.
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