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:
Feb. 09, 1993
Filed:
Mar. 17, 1992
Applicant:
Inventor:
Arthur J Begala, Naperville, IL (US);
Assignee:
Nalco Chemical Company, Naperville, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
D21H / ;
U.S. Cl.
CPC ...
1621681 ; 1621682 ; 1621683 ; 162183 ;
Abstract
A papermaking process includes the steps of adding to the papermaking cellulosic slurry first a high molecular weight cationic polymer and then a medium molecular weight anionic polymer, to improve drainage and retention. The anionic polymer includes ionizable sulfonate.