(19)

(11)

EP 0 765 193 A1

(12)

(43) Date of publication: 02.04.1997 Bulletin 1997/14 (21) Application number: 95927220.0 (22) Date of filing: 23.06.1995

(51) International Patent Classification (IPC):  B04B 1/ 20( . ) B04B 15/ 12( . ) (86) International application number: PCT/US1995/008982 (87) International publication number: WO 1996/000129 (04.01.1996 Gazette 1996/02)

(84) Designated Contracting States: BE CH DE FR GB IT LI SE (30) Priority: 27.06.1994 US 19940266240 07.06.1995 US 19950475044 (71) Applicant: AMOCO CORPORATION Chicago, IL 60680-0703 (US)	(72) Inventors: DESAI, Vikram, J. Naperville, IL 60540 (US) CALDWELL, John, W. Glenside, PA 19038 (US) LETKI, Alan, G. Mt. Laurel, NJ 08054 (US) (74) Representative: Ritter, Stephen David, et al  Mathys & Squire 100 Grays Inn Road London WC1X 8AL London WC1X 8AL (GB)