Photochromic articles
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United States of America Patent
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Aug 19, 1997
Grant Date -
N/A
app pub date -
Oct 30, 1995
filing date -
Oct 30, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A photochromic article comprising a host material and a photochromic amount of a photochromic compound or a structural isomer of the photochromic compound, the photochromic compound represented by the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.4, R.sub.5, R.sub.6, R.sub.8, A, B, C, and D are each selected from the group consisting essentially of hydrogen, a stable organic radical, a heterocyclic group, halogen, a nitrogen-substituted radical, and a nitrogen-substituted ring radical.
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