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. 23, 1997
Filed:
Jan. 23, 1995
Applicant:
Inventor:
Guido Di Napoli, Collonge-Bellerive, CH;
Assignee:
Laboratoire Medidom S.A., Geneva, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07F / ; C07C / ; C07C / ;
U.S. Cl.
CPC ...
560 76 ; 560239 ; 560131 ; 552262 ;
Abstract
The present invention relates to a process for the preparation of 1,8-diacetoxy-3-carboxyanthraquinone, also known as diacerein, via aloin acetylation, oxidation of the acetylated product, and purification of the raw diacerein obtained by means of crystallization from 2-methoxyethanol or N,N-dimethylacetamide and optionally by dissolution of the corresponding salt with triethylamine in methylene chloride, followed by removal of the insoluble residue.
Quick Actions:
Di Napoli, Guido. (1997). Process for the preparation of diacerein (U.S. Patent No. 5670695). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5670695
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile