Photochromic glass and lens
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United States of America Patent
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Dec 26, 2000
Issued Date -
N/A
app pub date -
Sep 8, 1999
filing date -
Nov 7, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fixed tint, photochromic glasses and sunglass lenses produced therefrom. The glasses have R.sub.2 O--Al.sub.2 O.sub.3 --B.sub.2 O.sub.3 --SiO.sub.2 base compositions, contain silver chloride and bromide contents as photochromic constituents and 0.22-0.38% NiO and 0.034-0.060% CoO, both by weight percent, as glass colorants, the NiO:CoO ratio being in the range of 5.5-7.2:1.
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