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. 31, 2017
Filed:
Oct. 10, 2008
Applicants:
Cornelia Adriana DE Wolf, Eerbeek, NL;
James N. Lepage, Chicago, IL (US);
Johanna Hendrika Bemelaar, Arnhem, NL;
Inventors:
Cornelia Adriana De Wolf, Eerbeek, NL;
James N. Lepage, Chicago, IL (US);
Johanna Hendrika Bemelaar, Arnhem, NL;
Assignee:
AKZO NOBEL CHEMICALS INTERNATIONAL B.V., Arnhem, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K 8/74 (2006.01); C11D 3/04 (2006.01); C11D 3/20 (2006.01); C11D 3/30 (2006.01); C11D 7/08 (2006.01); C11D 7/26 (2006.01); C11D 7/32 (2006.01); C25D 3/02 (2006.01); C09K 8/528 (2006.01);
U.S. Cl.
CPC ...
C09K 8/74 (2013.01); C09K 8/528 (2013.01); C11D 3/042 (2013.01); C11D 3/2075 (2013.01); C11D 3/30 (2013.01); C11D 7/08 (2013.01); C11D 7/265 (2013.01); C11D 7/3245 (2013.01); C25D 3/02 (2013.01);
Abstract
An acidic aqueous solution containing a chelating agent and an acid, wherein the chelating agent is glutamic acid N,N-diacetic acid (GLDA) or a salt thereof, and wherein the amount of GLDA or the salt thereof is at least 10 wt %, based on the weight of the aqueous solution, and to the use thereof as an oilfield chemical, in descaling processes, or in processes in which highly concentrated aqueous acids are used, such as cleaning processes or plating processes.