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:
Sep. 03, 2013
Filed:
Feb. 08, 2006
Karl Kolter, Limburgerhof, DE;
Ivette Garcia Castro, Ludwigshafen Gartenstadt, DE;
Olga Pinneker, Hessheim, DE;
Ralf Widmaier, Mannheim, DE;
Karl-hermann Strube, Speyer, DE;
Bernhard Fussnegger, Kirrweiler, DE;
Manfred Kroll, Ludwigshafen, DE;
Frank Höfer, Bad Dürkheim, DE;
Hermann Ascherl, Dirmstein, DE;
Peter Schmidt, Weisenheim, DE;
Karl Kolter, Limburgerhof, DE;
Ivette Garcia Castro, Ludwigshafen Gartenstadt, DE;
Olga Pinneker, Hessheim, DE;
Ralf Widmaier, Mannheim, DE;
Karl-Hermann Strube, Speyer, DE;
Bernhard Fussnegger, Kirrweiler, DE;
Manfred Kroll, Ludwigshafen, DE;
Frank Höfer, Bad Dürkheim, DE;
Hermann Ascherl, Dirmstein, DE;
Peter Schmidt, Weisenheim, DE;
BASF SE, , DE;
Abstract
Method for stabilizing polyvinylpyrrolidones, which comprises treating the polyvinylpyrrolidones with sulfur dioxide, sulfurous acid or alkali metal sulfites and then with free-radical scavenger, and converting the solutions treated in this way into the powdered polyvinylpyrrolidones by drying.