(19)

(11)

EP 2 212 751 A1

(12)

(43) Date of publication: 04.08.2010 Bulletin 2010/31 (21) Application number: 08852151.3 (22) Date of filing: 12.11.2008

(51) International Patent Classification (IPC):  G05B 13/04(2006.01) C25C 3/20(2006.01) (86) International application number: PCT/NO2008/000402 (87) International publication number: WO 2009/067019 (28.05.2009 Gazette 2009/22)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 19.11.2007 NO 20075933 (71) Applicant: Norsk Hydro ASA 0240 Olso (NO)	(72) Inventor: KOLÅS, Steinar N-7054 Ranheim (NO) (74) Representative: Berg, André  Hydro Aluminium AS Patent and Trademark Department Drammensveien 264 0240 Oslo 0240 Oslo (NO)