Heterocyclically annellated indenochromene derivatives
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United States of America Patent
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Apr 19, 2005
Grant Date -
May 13, 2004
app pub date -
Nov 25, 2003
filing date -
Nov 10, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to specific photochromic heterocyclically annellated indenochromene derivatives and the use thereof in plastics of all types, particularly for ophthalmic applications. In particular, the present invention relates to indeno[1,2-h]chromene derivatives having the following general formula (I) and indeno[2,1-f]chromene derivatives having the following general formula (II): ##STR1##
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