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:
Dec. 14, 2004
Filed:
Feb. 06, 1997
Applicant:
Inventors:
Matti Siika-Aho, Helsinki, FI;
Johanna Buchert, Espoo, FI;
Tapani Vuorinen, Espoo, FI;
Anita Teleman, Espoo, FI;
Maija Tenkanen, Espoo, FI;
Michael Bailey, Espoo, FI;
Liisa Viikari, Helsinki, FI;
Assignee:
Valtion Teknillinen Tutkimuskeskus, Espoo, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 2/502 ;
U.S. Cl.
CPC ...
D21H 2/502 ;
Abstract
The present invention concerns a method for enzymatic treatment of lignocellulosic materials which contain xylan-polymers, such as cellulose kraft pulps. According to a method of the present kind, at least a part of the hexenuronic acid groups present in the material is selectively removed in order to remove metal ions from the pulp, to change the surface charge thereof, to improve the brightness stability of the pulp and to render the material more suitable for enzymatic treatment.