(19)

(11)

EP 2 457 054 A1

(12)

(43) Date of publication: 30.05.2012 Bulletin 2012/22 (21) Application number: 10802502.4 (22) Date of filing: 30.06.2010

(51) International Patent Classification (IPC):  F28F 9/26(2006.01) F24J 2/26(2006.01) (86) International application number: PCT/NO2010/000255 (87) International publication number: WO 2011/010931 (27.01.2011 Gazette 2011/04)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 22.07.2009 NO 20092748 (71) Applicant: Norsk Hydro ASA 0240 Olso (NO)	(72) Inventors: MILLS, John Cumbria CA14 1SL (GB) HARTLEY, Kevin Cumbria CA13 9DU (GB) KERR, Peter CA13 9TS (GB) (74) Representative: Hofseth, Svein  Patent and Trademark Department Hydro Aluminium AS 0240 Oslo 0240 Oslo (NO)