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:
Nov. 11, 2014
Filed:
Mar. 14, 2013
Wisconsin Alumni Research Foundation, Madison, WI (US);
Hector F. DeLuca, Deerfield, WI (US);
Agnieszka Flores, Madison, WI (US);
James B. Thoden, Madison, WI (US);
Hazel M. Holden, Fitchburg, WI (US);
Wisconsin Alumni Research Foundation, Madison, WI (US);
Abstract
Disclosed are methods of purifying (20R) and (20S) analogs of 2-methylene-19-nor-22-dimethyl-1α,25-dihydroxyvitamin Dto obtain the (20R) and (20S) analogs in crystalline form. The method includes the steps of preparing a solvent of either diethyl ether or a mixture of 2-propanol and hexane, dissolving a product containing the (20R) and (20S) analog to be purified in the solvent, cooling the solvent and dissolved product below ambient temperature for a sufficient amount of time to form a precipitate of crystals, and recovering the crystals.