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:
Apr. 26, 2011
Filed:
Sep. 08, 2009
Konrad Bitter, Herzogenaurach, DE;
Ursula Hollwedel, Schnaittach, DE;
Enkhtsetseg Batchuluun, Erlangen, DE;
Konrad Bitter, Herzogenaurach, DE;
Ursula Hollwedel, Schnaittach, DE;
Enkhtsetseg Batchuluun, Erlangen, DE;
Areva NP GmbH, Erlangen, DE;
Abstract
A method to remove deposits containing magnetite and copper from a container, particularly from a steam generator of a nuclear power plant. In a first step, the container is treated using an alkaline cleaning solution containing a complexing agent forming a soluble complex with iron ions, a reducing agent, and an alkalizing agent. In a second step a further complexing agent forming a more stable complex with iron III ions than the complexing agent used in the first step and an oxidant are added to the cleaning solution of the first step present in the container.