Polymeric photo-chromic composition
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United States of America Patent
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Aug 10, 1999
Grant Date -
N/A
app pub date -
Dec 12, 1997
filing date -
Jan 6, 1997
priority date (Note) -
Expired
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Abstract
The present invention relates to the field of photo-chromic materials, in particular, to photo-chromic compounds and matrices suitable for use in optical memory systems, including three dimensional optical memory systems for computers, multimedia applications and the like. In particular, nonfluorescent spiropyrane is transformed into fluorescent merocyanine by electromagnetic radiation.
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