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:
Jan. 20, 2004
Filed:
Feb. 15, 2002
Applicant:
Inventor:
Anna Tigerström, Stockholm, SE;
Assignee:
AGA Aktiebolag, Lidingo, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21C 9/10 ; D21C 9/14 ; D21C 9/147 ; D21C 9/16 ;
U.S. Cl.
CPC ...
D21C 9/10 ; D21C 9/14 ; D21C 9/147 ; D21C 9/16 ;
Abstract
A process for the bleaching of lignin present in pulp fibers in an aqueous environment such as a pulp suspension. The invention also relates to a process for producing paper or board from pulp containing bleached lignin. According to the invention carbon dioxide is used for the bleaching of lignin.