External preparations
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United States of America Patent
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-
Feb 5, 1991
Grant Date -
N/A
app pub date -
Apr 22, 1988
filing date -
Apr 30, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
External preparations containing, as active ingredient, kojic acid purified by sublimation show higher stability against discoloration with the passage of time compared with conventional products containing otherwise purified kojic acid.
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