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. 06, 1997
Filed:
Sep. 16, 1994
Applicant:
Inventors:
Irenee J Philippe, Jacksonville, FL (US);
Frank J Sutman, Jacksonville, FL (US);
Thomas E Taggart, Jacksonville, FL (US);
Mary B Letscher, Jacksonville, FL (US);
Michael A Schuster, Jacksonville, FL (US);
John C Harrington, IV, Jacksonville, FL (US);
Assignee:
Betz Laboratories, Inc., Trevose, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D21C / ;
U.S. Cl.
CPC ...
162 60 ; 162 55 ; 162-4 ; 162 72 ; 1621641 ; 1621685 ; 1621681 ;
Abstract
The present invention is directed to a method for increasing the retention on a washing/thickening device in an aqueous papermaking system. The method generally comprises adding to the furnish solids of the system an effective amount of a cationic polyacrylamide polymer.