Photochromic 3H-naphthopyrans
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United States of America Patent
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Jan 13, 1998
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N/A
app pub date -
Dec 20, 1996
filing date -
Dec 20, 1995
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Expired
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Abstract
Photochromic compounds with a 3H-naphthopyran structure having at least one pyrene moiety in the 3-position, a method for preparing such compounds, and the use of such compounds for producing photochromic articles from an organic synthetic material.
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