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:
Jun. 17, 2025
Filed:
Dec. 09, 2020
Applicant:
Westrock Mwv, Llc, Atlanta, GA (US);
Inventors:
Peter W. Hart, Atlanta, GA (US);
John D. Dejarnette, Henrico, VA (US);
Fritz G. Paulsen, Summerville, SC (US);
Ashok K. Ghosh, Henrico, VA (US);
Assignee:
WestRock MWV, LLC, Atlanta, GA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
D21C 5/02 (2006.01); D21B 1/06 (2006.01); D21C 1/10 (2006.01); D21C 3/02 (2006.01); D21C 7/00 (2006.01); D21C 9/02 (2006.01); D21C 9/10 (2006.01); D21H 11/14 (2006.01);
U.S. Cl.
CPC ...
D21C 5/022 (2013.01); D21B 1/061 (2013.01); D21C 1/10 (2013.01); D21C 3/02 (2013.01); D21C 7/00 (2013.01); D21C 9/02 (2013.01); D21C 9/10 (2013.01); D21H 11/14 (2013.01);
Abstract
A method for manufacturing bleached pulp from a feedstock that includes recycled paper. The method includes steps of: (1) impregnating the feedstock with cooking liquor to yield an impregnated material having a liquor-to-fiber mass ratio of at most about 4:1; (2) cooking the impregnated material to remove at least a portion of the lignin within the impregnated material, thereby yielding a cooked pulp; and (3) bleaching the cooked pulp.