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. 06, 1992
Filed:
Jan. 14, 1991
Applicant:
Inventors:
Michel Mazet, Limoges, FR;
Isabelle Rigaudie, Rodez, FR;
Daniel Wattiez, Lissieu, FR;
Roger Chatelin, Lissieu, FR;
Jean-Francois Combes, Lyons, FR;
Louis Gavet, Lyons, FR;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F / ;
U.S. Cl.
CPC ...
210638 ; 210683 ; 21050029 ; 21050035 ;
Abstract
The invention relates to the use of grafted celluloses, in fibrous form, particularly paper, non-woven web, flock, yarn, woven fabric, comprising quaternary ammonium functions, for eliminating humic substances and nitrates contained in natural water or industrial sewage. The grafted cellulose is for example obtained by radical grafting with the aid of a non-saturated monomer with quaternary ammonium function, particularly quaternized diethyl-amino-ethyl methacrylate. Its capacity is greater than or equal to 0.2 meq/g.