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:
Jul. 20, 2010
Filed:
Aug. 03, 2005
Applicants:
Holger Evers, Mannheim, DE;
Michael Jödecke, Bobenheim-Roxheim, DE;
Johann-peter Melder, Böhl-Iggelheim, DE;
Gunther Van Cauwenberge, Wachenheim, DE;
Jan Nouwen, Brecht, BE;
Inventors:
Holger Evers, Mannheim, DE;
Michael Jödecke, Bobenheim-Roxheim, DE;
Johann-Peter Melder, Böhl-Iggelheim, DE;
Gunther Van Cauwenberge, Wachenheim, DE;
Jan Nouwen, Brecht, BE;
Assignee:
BASF Aktiengesellschaft, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 3/42 (2006.01); C07D 295/023 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to a process for improving the color stability by postpurifying piperazine, the steps comprising The invention further provides a rapid test of aging for checking the improvement in the color stability.