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. 09, 1980
Filed:
Jul. 23, 1979
Applicant:
Inventor:
James A Hyde, Downers Grove, IL (US);
Assignee:
Nalco Chemical Company, Oak Brook, IL (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
D21C / ;
U.S. Cl.
CPC ...
162 76 ; 162 79 ; 162 80 ; 162 89 ;
Abstract
A method for increasing the final brightness of pulp contaminated with iron or manganese in a chlorine bleaching process of the type comprising one or more alkaline stages which comprises treating the pulp with at least 0.1 lbs. per ton of a water-soluble chelating agent.