Organic photochromic compound, a dimer of pyrido quinoline
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United States of America Patent
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Feb 25, 1992
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N/A
app pub date -
Apr 24, 1990
filing date -
Apr 27, 1989
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Expired
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Abstract
An organic photochromic compound with improved long term preservability, thermal stability, the repetition character of the record and the like and useful as recording-memory materials or photosensitizers, comprising dimers of the compounds selected from the group consisting of pyrido[3,4-g]isoquinoline, pyrido[2,3-g]quinoline, pyrido[3,2-g]quinoline and pyrido[3,2-g]quinoline derivatives.
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