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. 18, 2008
Filed:
Nov. 11, 2005
Applicants:
Stefano Carlino, Collombey, CH;
Guido Di Napoli, Collonge-Bellerive, CH;
Inventors:
Stefano Carlino, Collombey, CH;
Guido Di Napoli, Collonge-Bellerive, CH;
Assignee:
Laboratoire Medidom S.A., Geneva, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 45/27 (2006.01); C07C 45/00 (2006.01); C09B 1/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A process for preparing aloe-emodin from aloin by oxidizing aloin by treatment with an oxygen-containing gas in the presence of an acid. The aloe-emodin may be used for the production of rhein and diacerein by oxidizing aloe-emodin by treatment with a chromium-free oxidizing medium to obtain rhein and purifying the rhein obtained. The rhein may be acetylated to obtain diacerein.