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. 19, 2005
Filed:
Dec. 09, 2003
Anthony Parrish, Kalama, WA (US);
Roger O. Campbell, Federal Way, WA (US);
Raymond E. Harrison, Longview, WA (US);
Paul B. Mobley, Kalama, WA (US);
Gregg Mccarthy, Vancouver, WA (US);
Anthony Parrish, Kalama, WA (US);
Roger O. Campbell, Federal Way, WA (US);
Raymond E. Harrison, Longview, WA (US);
Paul B. Mobley, Kalama, WA (US);
Gregg McCarthy, Vancouver, WA (US);
North American Paper Corporation, Longview, WA (US);
Abstract
Methods of bleaching mechanical pulp under alkaline conditions with hydrogen peroxide. The methods include introducing a source of magnesium ions and hydroxyl ions to a refiner. The wood particulates are refined into a pulp in the presence of the magnesium ions and hydroxyl ions, and optionally perhydroxyl ions to simultaneously refine and bleach the pulp in a refiner.