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. 24, 2009
Filed:
Jul. 23, 2007
Brian Walchuk, Hockessin, DE (US);
Fushan Zhang, Jacksonville, FL (US);
John C. Harrington, Jacksonville, FL (US);
William Sean Carey, Wallingford, PA (US);
Richard Lee Brady, Wilmington, DE (US);
Brian Walchuk, Hockessin, DE (US);
Fushan Zhang, Jacksonville, FL (US);
John C. Harrington, Jacksonville, FL (US);
William Sean Carey, Wallingford, PA (US);
Richard Lee Brady, Wilmington, DE (US);
Hercules Incorporated, Wilmington, DE (US);
Abstract
A papermaking method and a composition which utilize, as a drainage aid, a water-soluble anionic copolymer prepared via a water-in-oil polymerization technique that, absent a cross-linking agent, is characterized by a Huggins' constant (k') determined in 0.01M NaCl greater than 0.75 and a storage modulus (G′) for a 1.5 wt. % actives polymer solution at 4.6 Hz greater than 175 Pa.