(19)

(11)

EP 2 111 473 A1

(12)

(43) Date of publication: 28.10.2009 Bulletin 2009/44 (21) Application number: 07865579.2 (22) Date of filing: 12.12.2007

(51) International Patent Classification (IPC):  C22C 19/05(2006.01) C22F 1/10(2006.01) (86) International application number: PCT/US2007/087256 (87) International publication number: WO 2008/100356 (21.08.2008 Gazette 2008/34)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR (30) Priority: 16.02.2007 US 707489 (71) Applicant: BAKER HUGHES INCORPORATED Houston, TX 77027 (US)	(72) Inventors: BAILEY, William, M. Humble, TX 77346 (US) HOLMES, Kevin, C. Houston, TX 77027 (US) (74) Representative: Jeffrey, Philip Michael  Frank B. Dehn & Co. St Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)