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:
Aug. 09, 2011
Filed:
Sep. 27, 2007
Helmut Meffert, Bobenheim am Berg, DE;
Marianna Pierobon, Ludwigshafen, DE;
Tobias Petsch, Mörschied, DE;
Julia Brodersen, Hamburg, DE;
Hermann Josef Feise, Kleinniedesheim, DE;
Ates Erk, Karlsruhe, DE;
Jörg Kreβ, Mannheim, DE;
Ralf Mar, Hochspeyer, DE;
Robert Bayer, Sinsheim, DE;
Helmut Meffert, Bobenheim am Berg, DE;
Marianna Pierobon, Ludwigshafen, DE;
Tobias Petsch, Mörschied, DE;
Julia Brodersen, Hamburg, DE;
Hermann Josef Feise, Kleinniedesheim, DE;
Ates Erk, Karlsruhe, DE;
Jörg Kreβ, Mannheim, DE;
Ralf Mar, Hochspeyer, DE;
Robert Bayer, Sinsheim, DE;
BASF SE, Ludwigshafen, DE;
Abstract
Processes comprising: (i) providing a filter aid comprising a co-extrudate of a water-insoluble polyvinylpyrrolidone and a thermoplastic polymer, (ii) treating the filter aid with aqueous alkali; (iii) subsequently treating the filter aid with an enzyme; and (iv) subsequently thereto carrying out a second treatment with aqueous alkali, to provide a regenerated filter aid, and uses therefor.