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:
Nov. 26, 2013
Filed:
Dec. 03, 2009
Yujun Sun, Beaconsfield, CA;
Richard Mckinnon Berry, Notre-Dame-de-l'lle Perrot, CA;
Theodore Radiotis, Laval, CA;
Yujun Sun, Beaconsfield, CA;
Richard McKinnon Berry, Notre-Dame-de-l'lle Perrot, CA;
Theodore Radiotis, Laval, CA;
FPInnovations, Pointe-Claire, Quebec, CA;
Abstract
Impregnating or spraying softwood chips in a solution containing an appropriate concentration of alkaline earth metal ions selected from the group consisting of calcium ions, barium ions and strontium, preferably calcium ions, at room temperature before a reductive alkaline pulping process, for example kraft pulping, significantly increases pulp yield. Using an agent that complexes with the metal ions, such as hydroxyethylidene diphosphonic acid (HEDP) allows this benefit of metal ions to be achieved during the pulping process rather than in a separate impregnation step.