Diaryl-2H-naphthopyrans
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United States of America Patent
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Mar 14, 2000
Issued Date -
N/A
app pub date -
Jul 31, 1998
filing date -
Jul 11, 1994
priority date (Note) -
Expired
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Abstract
Photochromic diaryl-2H-naphthopyran structures, which dye photochromically well at room temperature, lighten up quickly when incorporated into ophthalmic lenses, possess longevity, and due to their spacial structures, have a reduced tendency of the molecules to migrate in plastics.
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