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:
May. 08, 2012
Filed:
Sep. 12, 2007
Applicants:
Weiguo Cheng, Naperville, IL (US);
Ross T. Gray, Plainfield, IL (US);
Inventors:
Weiguo Cheng, Naperville, IL (US);
Ross T. Gray, Plainfield, IL (US);
Assignee:
Nalco Company, Naperville, IL (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D21H 17/33 (2006.01); D21H 17/63 (2006.01); D21H 17/67 (2006.01); C09C 1/02 (2006.01); C09C 1/42 (2006.01); C09C 3/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method of preparing a stable dispersion of flocculated filler particles for use in papermaking processes comprises sequential addition of high and low molecular weight flocculating agents to an aqueous dispersion of filler particles followed by shearing of the resultant filler flocs to the desired particle size resulting in shear resistant filler flocs with a defined and controllable size distribution.