The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 01, 2008
Filed:
Nov. 18, 2003
Applicants:
Anchel Schwartz, Rehovot, IL;
Asher Maimon, Petach Tiqva, IL;
Inventors:
Anchel Schwartz, Rehovot, IL;
Asher Maimon, Petach Tiqva, IL;
Assignee:
Teva Pharmaceutical Industries Ltd, Petah Tiqva, IL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 35/08 (2006.01);
U.S. Cl.
CPC ...
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.