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. 23, 2021
Filed:
Sep. 30, 2016
Applicant:
Kemira Oyj, Helsinki, FI;
Inventors:
Christopher Michael Lewis, Vancouver, WA (US);
William James Garrisi, Camillus, NY (US);
Assignee:
Kemira Oyj, Helsinki, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 17/37 (2006.01); D21H 11/14 (2006.01); D21H 17/45 (2006.01); D21H 17/68 (2006.01); D21H 21/10 (2006.01); D21H 17/44 (2006.01); D21H 23/20 (2006.01); D21H 21/20 (2006.01); D21H 21/18 (2006.01); D21H 11/18 (2006.01);
U.S. Cl.
CPC ...
D21H 23/20 (2013.01); D21H 11/14 (2013.01); D21H 11/18 (2013.01); D21H 17/375 (2013.01); D21H 17/44 (2013.01); D21H 17/45 (2013.01); D21H 17/68 (2013.01); D21H 21/10 (2013.01); D21H 21/18 (2013.01); D21H 21/20 (2013.01);
Abstract
An improved process for making paper or paper board is provided. The process comprises providing a cellulosic fibre suspension comprising recycled fibre material, and having a conductivity of at least 1.5 mS/cm; and adding a glyoxalated copolymer of acrylamide and cationic monomers and inorganic siliceous microparticles to the fibre suspension, sequentially or simultaneously. Advantages comprise improved productivity of the process, and paper strength.