Photochromic spirodihydrophenanthropyrans
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United States of America Patent
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Sep 6, 2011
Grant Date -
Oct 23, 2008
app pub date -
May 9, 2008
filing date -
Nov 10, 2005
priority date (Note) -
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Abstract
Specific photochromic spirodihydrophenanthropyrans and their use in synthetic resin materials of all kinds, particularly for ophthalmic purposes. The compounds of the invention are photochromic pyran compounds derived from 9,10-dihydrophenanthrene in which at least one of the two carbon atoms at positions 9 and 10 belongs to a further ring system and thus forms a spiro linkage point.
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