Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Anchel Schwartz1
Asher Maimon1
Date of Patent
April 1, 2008
1Patent Application Number
107171481
Date Filed
November 18, 2003
1Patent Primary Examiner
Patent abstract
Provided is a crystallization method for reducing the level of impurities in calcipotriene in which a solution of a starting calcipotriene in a first process solvent, for example THF, is combined with second process solvent, for example methyl formate, and, after cooling, calcipotriene is isolated. The method can include a slurry step for reducing the level of residual first process solvent.
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