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:
Sep. 13, 2016
Filed:
Apr. 23, 2012
Applicants:
Lei YE, Chongqing, CN;
Zuyuan Rong, Chongqing, CN;
Inventors:
Lei Ye, Chongqing, CN;
Zuyuan Rong, Chongqing, CN;
Assignee:
CHONGQING RUNZE PHARMACEUTICAL CO., LTD., Chongqing, CN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 207/273 (2006.01);
U.S. Cl.
CPC ...
C07D 207/273 (2013.01);
Abstract
A method for purifying (S)-oxiracetam is disclosed. Crude (S)-oxiracetam with the purity of 89% is dissolved in water; the solution is allowed to stand for 1 to 3 days at 0° C. to 18° C.; a colorless transparent crystal is precipitated; the solution is filtered and top-washed with cold water to 0° C. to 5° C.; and the product is dried in vacuum to obtain high-purity (S)-oxiracetam.
Ye, Lei. (2016). Method for purifying (s)-oxiracetam (U.S. Patent No. 9440918). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/9440918
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile