IR and UV absorbing brown solar glasses, ophthalmic lenses
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United States of America Patent
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Jul 3, 2001
Grant Date -
N/A
app pub date -
Feb 7, 2000
filing date -
May 7, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The object of the present invention is brown solar glasses, absorbing UV or IR radiation, as well as solar ophthalmic lenses in said glasses. Said glasses have the following composition, expressed in percentages by weight: SiO.sub.2 : 64-71; B.sub.2 O.sub.3 : 2-8; Al.sub.2 O.sub.3 : 0-4; ZrO.sub.2 : 0-2; Li.sub.2 O: 0-4; Na.sub.2 O: 6-10; K.sub.2 O: 7-16; CaO: 0-5.5; ZnO: 0-5.5; TiO.sub.2 ; 0-2; Fe.sub.2 O.sub.3 : 3-9; Co.sub.3 O.sub.4 : 0-0.030; NiO: 0-0.2; SeO.sub.2 : 0.0030-0.1; As.sub.2 O.sub.3 : 0-0.1; Sb.sub.2 O.sub.3 : 0-0.1; SnO.sub.2 : 0-0.1; Cl: 0-2; Br: 0-2; F: 0-2.
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