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. 13, 1991
Filed:
May. 23, 1990
Applicant:
Inventors:
Axel von Raven, Seeshaupt, DE;
Josef Weigl, Munich, DE;
Friedrich Ruf, Tiefenbach, DE;
Herbert Mayer, Kleinberghofen, DE;
Assignee:
Sud-Chemie, Aktiengesellschaft, Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21C / ;
U.S. Cl.
CPC ...
162 78 ; 162 80 ; 8111 ;
Abstract
A method for bleaching pulp using an alkaline, peroxide-containing bleaching agent for chemical pulp, mechanical pulp, waste paper and/or mixtures thereof, which optionally contains water glass and/or a complexing agent, contains, as an additive, a silicate ion exchanger which has been modified using an alkali metal carbonate or alkali metal hydrogen carbonate.