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. 17, 1991
Filed:
Jul. 12, 1990
Applicant:
Inventors:
Hans U Suess, Hasselroth, DE;
Wilfried Eul, Ramsey, NJ (US);
Assignee:
Degussa Aktiengesellschaft, Frankfurt am Main, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D21C / ;
U.S. Cl.
CPC ...
252402 ; 162-6 ; 162-7 ; 162 76 ; 162 89 ; 162 65 ;
Abstract
A process is described in which, by the addition of formamidinesulfinic acid in association with an ozone or ozone/oxygen treatment, the viscosity and strength of wood pulps are stabilized at the level that is obtained with use of conventional, chlorine-containing bleaching processes.