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. 04, 1999
Filed:
Nov. 13, 1997
Applicant:
Inventors:
Thor Thorsen, Trondheim, NO;
Per Oscar Wiig, Trondheim, NO;
Ole Wae butted.rnes, Trondheim, NO;
Birger Langseth, Porsgrunn, NO;
Carl Margcotte, Portneuf-Station, CA;
Assignee:
Norsk Hydro ASA, Oslo, NO;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
210652 ; 210651 ; 210653 ; 210641 ; 210636 ;
Abstract
Method for sulphate removal from concentrated MgCl.sub.2 solutions, where the solution is subjected to a high pressure nanofiltration process applying membranes having a dominantly negative surface charge.