Photochromic spiroxazines, compositions and articles containing them
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United States of America Patent
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Feb 29, 2000
Grant Date -
N/A
app pub date -
Jan 28, 1998
filing date -
Aug 30, 1995
priority date (Note) -
Expired
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Abstract
The invention concerns photochromic compounds having a formula (I), where R.sup.1 is a polycyclo group formed by at least one alicyclic group linked to, bridged or condensed, with at least one other aliphatic or aromatic ring. ##STR1##
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