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:
Apr. 10, 1990
Filed:
Dec. 23, 1988
Applicant:
Inventors:
Gregory J Siminoski, Ancaster, CA;
Tadas S Macas, West Vancouver, CA;
Assignee:
C-I-L Inc., North York, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21C / ;
U.S. Cl.
CPC ...
162 78 ; 162 80 ;
Abstract
A rapid, single stage process for the bleaching of high yield lignocellulose pulp (mechanical pulp) to enhanced brightness levels with hydrogen peroxide in the presence of magnesium sulphate and sodium silicate, with a substantial reduction in the wasteful, non-bleaching reactions of hydrogen peroxide. The residual hydrogen peroxide liquor may be recycled to a pulping or bleaching process.