(19)

(11)

EP 1 922 390 A2

(12)

(88) Date of publication A3: 04.10.2007 (43) Date of publication: 21.05.2008 Bulletin 2008/21 (21) Application number: 06813277.8 (22) Date of filing: 01.08.2006

(51) International Patent Classification (IPC):  C10G 35/04(2006.01) (86) International application number: PCT/US2006/030156 (87) International publication number: WO 2007/019196 (15.02.2007 Gazette 2007/07)

(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: 04.08.2005 US 706124 P (71) Applicant: Chevron U.S.A., Inc. San Ramon, CA 94583 (US)	(72) Inventors: MAESEN, Theodorus, Ludovicus, Michael Point Richmond, CA 94871 (US) KRISHNA, Kamala, R. Danville, CA 94526 (US) (74) Representative: Nash, David Allan  HASELTINE LAKE Redcliff Quay 120 Redcliff Street Bristol BS1 6HU Bristol BS1 6HU (GB)