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:
Apr. 30, 1979
Applicant:
Inventor:
John A Histed, L'Orignal, CA;
Assignee:
Canadian International Paper Company, Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21C / ;
U.S. Cl.
CPC ...
162 60 ; 162 89 ;
Abstract
A multi-stage, bleaching process for alkaline cooked pulps, including at least four bleaching stages and no more than three washing steps, is provided, wherein certain of the bleaching stages are shortened to less than about 15 minutes.