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:
Dec. 11, 2007
Filed:
May. 16, 2001
Applicants:
Bernd Eck, Viernheim, DE;
Dieter Baumann, Walldorf, DE;
Joerg Heilek, Bammental, DE;
Klaus Joachim Mueller-engel, Stutensee, DE;
Inventors:
Bernd Eck, Viernheim, DE;
Dieter Baumann, Walldorf, DE;
Joerg Heilek, Bammental, DE;
Klaus Joachim Mueller-Engel, Stutensee, DE;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07C 51/42 (2006.01);
U.S. Cl.
CPC ...
Abstract
Crude acrylic acid is purified batchwise by crystallization by a process which comprises at least one purification stage and at least one stripping stage and in which at least the first stripping stage is carried out in a different crystallizer from the first purification stage.