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. 19, 2013
Filed:
Jun. 21, 2011
Applicants:
Martin Hellsten, Ödsmål, SE;
Hans Oskarsson, Stenungtsund, SE;
Inventors:
Martin Hellsten, Ödsmål, SE;
Hans Oskarsson, Stenungtsund, SE;
Assignee:
Akzo Nobel N.V., Arnhem, NL;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
F17D 1/16 (2006.01); B01D 17/00 (2006.01); B01F 17/18 (2006.01); C08K 5/00 (2006.01); C11D 1/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to the use of a zwitterionic surfactant in combination with an ether sulphate or ether carboxylate surfactant in a water-based system as a drag-reducing agent. The combination has besides a high drag-reducing effect also a low sensitivity to hard water.