(19)

(11)

EP 0 415 935 A1

(12)

(43) Date of publication: 13.03.1991 Bulletin 1991/11 (21) Application number: 89903557.0 (22) Date of filing: 03.03.1989

(51) International Patent Classification (IPC):  C10G 11/ 18( . ) (86) International application number: PCT/US1989/001012 (87) International publication number: WO 1990/009842 (07.09.1990 Gazette 1990/21)

(84) Designated Contracting States: BE DE FR GB IT NL (71) Applicant: MOBIL OIL CORPORATION New York New York 10017 (US)	(72) Inventor: OWEN, Hartley Belle Mead, NJ 08502 (US) (74) Representative: Curtis, Philip Anthony  Mobil Services Company Limited Patent Department Mobil House 54-60 Victoria Street London SW1E 6QB London SW1E 6QB (GB)