Photochromic compounds (7)
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United States of America Patent
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Sep 1, 1998
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N/A
app pub date -
Feb 27, 1995
filing date -
Jun 28, 1993
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Expired
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Abstract
Disclosed are photochromic oxazine compounds, yielded by means of condensation of an aldehyde bearing in the .alpha.-position to the aldehyde group a halogen or hydroxy group (reacting agent 1), with (substituted) ortho-aminohydroxy aromatic compounds (reacting agent 2).
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