Glass
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United States of America Patent
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Mar 1, 2011
Grant Date -
Oct 16, 2008
app pub date -
Jan 12, 2006
filing date -
Jan 17, 2005
priority date (Note) -
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Abstract
Glass has optical constants of a refractive index (nd) of 1.79 or over and an Abbe number (νd) of 27 or over and a specific gravity (D) of 3.20 or over and is free from devitrification in the interior of the glass in a reheat test. The glass has chemical durability according to the Powder Method (acid-proof property RA according to the Powder Method) which is Class 1.
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