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:
Apr. 06, 2010
Filed:
Jun. 17, 2005
Applicants:
Nikolai (Mykola) Ignatyev, Duisburg, DE;
Urs Welz-biermann, Heppenheim, DE;
Peter Barthen, Rheinberg, DE;
Helge Willner, Muelheim/Ruhr, DE;
Inventors:
Nikolai (Mykola) Ignatyev, Duisburg, DE;
Urs Welz-Biermann, Heppenheim, DE;
Peter Barthen, Rheinberg, DE;
Helge Willner, Muelheim/Ruhr, DE;
Assignee:
Merck Patent Gesellschaft mit beschrankter Haftung, Darmstadt, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D 239/00 (2006.01); C07D 233/00 (2006.01); C07D 211/92 (2006.01); C07F 5/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to a process for the preparation of onium salts having a low chloride content by reaction of an onium chloride with an acid, where the hydrochloric acid forming is removed by azeotropic distillation by coordination to an organic solvent which forms an azeotropic mixture with water.