Photochromic heterocyclic fused indenonaphthopyrans
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United States of America Patent
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Dec 16, 1997
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app pub date -
Jan 16, 1997
filing date -
Jun 17, 1996
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Abstract
Described are novel photochromic heterocyclic fused indenonaphthopyran compounds having a substituted or unsubstituted heterocyclic ring fused to the g, h, i, n, o or p side of the indenonaphthopyran. These compounds may be represented by either of the following graphic formulae: ##STR1## Also described are polymeric organic host materials that contain or that are coated with such compounds.
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