(19)

(11)

EP 2 049 631 A2

(12)

(88) Date of publication A3: 17.04.2008 (43) Date of publication: 22.04.2009 Bulletin 2009/17 (21) Application number: 07840789.7 (22) Date of filing: 08.08.2007

(51) International Patent Classification (IPC):  C10M 133/12(2006.01) (86) International application number: PCT/US2007/075507 (87) International publication number: WO 2008/021901 (21.02.2008 Gazette 2008/08)

(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 Designated Extension States: AL BA HR MK RS (30) Priority: 09.08.2006 US 463532 (71) Applicant: Chevron Oronite Company LLC San Ramon, CA 94583 (US)	(72) Inventor: BOFFA, Alexander B. Oakland, California 94618 (US) (74) Representative: Nash, David Allan et al HASELTINE LAKE Redcliff Quay 120 Redcliff Street Bristol BS1 6HU Bristol BS1 6HU (GB)