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:
Dec. 20, 2011
Filed:
Jun. 12, 2009
Applicant:
Fang-ting Chiu, El Dorado Hills, CA (US);
Inventor:
Fang-Ting Chiu, El Dorado Hills, CA (US);
Assignee:
Ampac Fine Chemicals LLC., Rancho Cordova, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
C07D 339/00 (2006.01); C07D 409/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
R-α-Lipoic acid and its homologs are converted to their magnesium salts in the presence of a reduced form of the acid, dihydro-(+)-lipoic acid in the case of R-α-lipoic acid itself. The reduced form serves as a polymerization inhibitor, resulting in a Mg di-R-α-lipoate product of higher purity. The reduced acid retained in the product tends to convert to the starting acid, thereby avoiding the inclusion of an extraneous polymerization inhibitor in the product.