H-annellated benzo[f]chromenes
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United States of America Patent
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Feb 3, 2004
Grant Date -
Feb 27, 2003
app pub date -
May 10, 2002
filing date -
Sep 14, 2000
priority date (Note) -
Expired
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Abstract
The present invention relates to specific photochromic h-annellated benzo[f]chromene derivatives and their use in synthetic resins of all types, especially for ophthalmic applications. In particular, the present invention relates to photochromic compounds derived from benzo[f]chromenes, which in the open form have especially long-wave absorption maxima making it possible to obtain violet to blue tints when used in phototropic glasses.
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