Pentamethine dyestuffs and derivatives
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United States of America Patent
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-
Aug 11, 1992
Grant Date -
N/A
app pub date -
Aug 21, 1990
filing date -
Sep 13, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Dyestuffs of the formula ##STR1## and their base derivatives, in which the radicals have the meaning given in the description, are outstandingly suitable for laser transfer printing or as optical recording materials.
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