Photochromic benzopyran compounds
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United States of America Patent
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Feb 9, 1999
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N/A
app pub date -
Jul 17, 1997
filing date -
Jun 7, 1995
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Expired
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Abstract
Benzopyran compounds represented by the formulas: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, and R.sub.10 are selected from hydrogen, a stable organic radical, a heterocyclic group, halogen, a nitrogen-substituted group, and a nitrogen-substituted ring compound.
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