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:
Mar. 26, 2013
Filed:
Aug. 10, 2009
Hans-joachim Haehnle, Neustadt, DE;
Christian Jehn-rendu, Eppelheim, DE;
Rainer Blum, Mannheim, DE;
Ellen Krueger, Otterstadt, DE;
Norbert Schall, Roemerberg, DE;
Martin Ruebenacker, Altrip, DE;
Hans-Joachim Haehnle, Neustadt, DE;
Christian Jehn-Rendu, Eppelheim, DE;
Rainer Blum, Mannheim, DE;
Ellen Krueger, Otterstadt, DE;
Norbert Schall, Roemerberg, DE;
Martin Ruebenacker, Altrip, DE;
BASF SE, Ludwigshafen, DE;
Abstract
Process for the production of paper, board and cardboard having high dry strength by addition of at least one water-soluble (a) polymer comprising vinylamine units and at least one (b) polymer comprising ethylenimine units and at least one water-soluble polymeric anionic compound to a paper stock, draining of the paper stock with sheet formation and drying of the paper products, the water-soluble cationic polymers (a) and (b) being metered in any sequence or as a mixture into a paper stock, and papers which are obtainable by this process.