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:
Feb. 21, 1995
Filed:
Apr. 29, 1994
Applicant:
Inventors:
Alfons Carcasona, Koln, DE;
Wolf Grimminger, Bergisch Gladbach, DE;
Pentti Heitala, Helsinki, FI;
Klaus Witthohn, Overath, DE;
Helga Zaeske, Overath, DE;
Assignee:
Madaus AG, Cologne, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
552262 ;
Abstract
The present invention provides a process for obtaining diacetylrhein, wherein diacetylrhein containing aloe-emodin components is subjected to a liquid-liquid partitioning between a polar organic solvent which is only partly miscible with water and an aqueous phase of pH 6.5. to 7.5 and the diacetylrhein is recovered and optionally recrystallised. The present invention is also concerned with diacetylrhein obtainable by this process and with pharmaceutical compositions containing it.