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:
Mar. 10, 2009
Filed:
Apr. 07, 2004
Applicants:
Vidar Snekkenes, Karlstad, SE;
Krister Olsson, Karlstad, SE;
Inventors:
Vidar Snekkenes, Karlstad, SE;
Krister Olsson, Karlstad, SE;
Assignee:
Metso Fiber Karlstad AB, Karlstad, SE;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D21C 3/22 (2006.01);
U.S. Cl.
CPC ...
Abstract
The method is for the pre-treatment of chips that are fed to a sulphate cooking process. Through the addition of an acidic fluid to the steam treatment step, a very high ionic concentration of hydrogen ions is achieved. When the chips are subsequently formed into a slurry with a preferably sulphide-rich alkali cooking fluid, HS is formed locally in the chips, which gives a yield-increasing effect for the subsequent cooking step of l-3%.