(19)

(11)

EP 1 756 250 A2

(12)

(43) Date of publication: 28.02.2007 Bulletin 2007/09 (21) Application number: 05751814.4 (22) Date of filing: 23.05.2005

(51) International Patent Classification (IPC):  C10G 65/12(2006.01) C10G 65/02(2006.01) (86) International application number: PCT/US2005/018340 (87) International publication number: WO 2005/116171 (08.12.2005 Gazette 2005/49)

(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 MC NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR LV MK YU (30) Priority: 25.05.2004 US 854317 (71) Applicant: Chevron U.S.A. Inc. San Ramon, CA 94583 (US)	(72) Inventors: GUPTA, Avinash Bloomfield, NJ 07003 (US) VAIDYANATHAN, Shankar Landing, NJ 07850 (US) (74) Representative: Nash, David Allan  HASELTINE LAKE, Redcliff Quay 120 Redcliff Street Bristol BS1 6HU Bristol BS1 6HU (GB)