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. 19, 1991
Filed:
Aug. 13, 1990
Applicant:
Inventors:
Emmerich Pastorek, Hemsbach, DE;
Winfried Orth, Hassloch, DE;
Wolfgang Weiss, Neckarhausen, DE;
Hans W Kleffner, Battenberg, DE;
Assignee:
Rutgerswerke AG, , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
546180 ;
Abstract
A process for the recovery of isomeric pure 7-chloro-quinaldine from isomeric mixtures of chloro-quinaldines comprising dissolving the isomeric mixture of chloro-quinaldines in an organic solvent, adding an aqueous tartaric acid solution to the organic solution to form the tartrate of 7-chloro-quinaldine in crystalline form, recovering the crystals and treating the same with a base to obtain 7-chloro-quinaldine.