Photochromic compounds
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United States of America Patent
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Aug 3, 1982
Issued Date -
N/A
app pub date -
Jul 28, 1980
filing date -
Sep 8, 1978
priority date (Note) -
Expired
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Abstract
Photochromic compounds of the formula ##STR1## wherein one of R.sub.1 and R.sub.2 is halogen or lower alkoxy, and the other is hydrogen, R.sub.3 and R.sub.4 are hydrogen, lower alkyl, lower alkoxy, or halogen and R.sub.5 is an alkyl of 2 to 10 carbons, and their use in lenses are disclosed.
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