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. 01, 2008
Filed:
Apr. 15, 2003
Bernhard Dung, Mannheim, DE;
Felix Mueller, Frankenthal, DE;
Arno Boehm, Mannheim, DE;
Willi Helfer, Friedelsheim, DE;
Volker Weyrauch, Deidesheim, DE;
Georg Henning, Ludwigshafen, DE;
Bernhard Dung, Mannheim, DE;
Felix Mueller, Frankenthal, DE;
Arno Boehm, Mannheim, DE;
Willi Helfer, Friedelsheim, DE;
Volker Weyrauch, Deidesheim, DE;
Georg Henning, Ludwigshafen, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
A process for preparing perylene-3,4:9,10-tetracarboxylic diimides of the general formula I comprising in a reaction medium consisting essentially of an apolar aprotic organic solvent and an alkali metal base and subsequently reoxidizing the resulting alkali metal salt of the leuco form of the perylene-3,4:9,10-tetracarboxylic diimide in the presence of a polar solvent.