(19)

(11)

EP 1 853 685 A1

(12)

(43) Date of publication: 14.11.2007 Bulletin 2007/46 (21) Application number: 06735616.2 (22) Date of filing: 22.02.2006

(51) International Patent Classification (IPC):  C10M 173/00(2006.01) C10M 101/02(2006.01) C10M 171/06(2006.01) (86) International application number: PCT/US2006/006030 (87) International publication number: WO 2006/091562 (31.08.2006 Gazette 2006/35)

(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 NL PL PT RO SE SI SK TR (30) Priority: 22.02.2005 US 655288 P (71) Applicant: M-I L.L.C. Texas 77072 (US)	(72) Inventors: BRADBURY, Andrew Kincardineshire, Banchovy AB31 6PS (GB) OAKLEY, Doug Par, Cornwall PL24 2HJ (GB) SAWDON, Christopher Bradford-on-Avon, Wiltshire BA15 2RR (GB) (74) Representative: Gill, Stephen Charles et al Mewburn Ellis LLP York House 23 Kingsway London WC2B 6HP London WC2B 6HP (GB)