Photochromic compound and articles containing the same
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United States of America Patent
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Jun 26, 1990
Grant Date -
N/A
app pub date -
May 17, 1988
filing date -
May 17, 1988
priority date (Note) -
Expired
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Abstract
Described are novel spiro(benzindolino) benzoxazine compounds and compositions containing such compounds. Photochromic sprio(benzindolino) benzoxazines may be incorporated into plastic host materials to produce photochromic articles.
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