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:
Oct. 30, 2001
Filed:
May. 19, 1999
Applicant:
Inventors:
Michael Heard, Suffolk, VA (US);
Gordon Chen, Suffolk, VA (US);
John Oliver Stockwell, West Yorkshire, GB;
Assignee:
Ciba Specialty Chemicals Water Treatment Limited, Bradford, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F 2/004 ;
U.S. Cl.
CPC ...
C08F 2/004 ;
Abstract
Paper is made by a dual soluble polymer process in which a cellulosic suspension which usually contains alum or cationic coagulant is first flocculated with a high IV cationic synthetic polymer or cationic starch and, after shearing, the suspension is reflocculated by the addition of a branched anionic water soluble polymer having IV above 3 dl/g and tan delta at 0.005 Hz of at least 0.5. The process gives an improved combination of formation, retention and drainage.