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. 04, 2014
Filed:
Sep. 05, 2012
Applicant:
S. Ananda Weerawarna, Seattle, WA (US);
Inventor:
S. Ananda Weerawarna, Seattle, WA (US);
Assignee:
Weyerhaeuser NR Company, Federal Way, WA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
D21C 9/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Manufacturing carboxylated fiber by catalytically carboxylating cellulose fiber in at least two catalytic carboxylation stages in series in which a primary catalyst and secondary oxidizing agent and, if necessary, pH adjustment agent is added at the beginning of each stage.