(19)

(11)

EP 1 032 547 A1

(12)

(43) Date of publication: 06.09.2000 Bulletin 2000/36 (21) Application number: 98954598.3 (22) Date of filing: 13.11.1998

(51) International Patent Classification (IPC)7: C04B 41/50, C04B 41/51, B01D 39/20 (86) International application number: PCT/GB9803/436 (87) International publication number: WO 9928/273 (10.06.1999 Gazette 1999/23)

(84) Designated Contracting States: DE (30) Priority: 28.11.1997 US 66858 P 29.09.1998 US 102340 P (71) Applicant: Foseco International Limited Swindon,Wiltshire SN3 1RE (GB)	(72) Inventors: RAY, Steven Warwick V34 5EQ (GB) STANKIEWICZ, Edwin Paul Moorpark, CA 93021 (US) (74) Representative: Lewis, Pauline Therese  Burmah Castrol Trading Limited,Group Patents Department,Burmah Castrol House,Pipers Way Swindon,Wiltshire SN3 1RE Swindon,Wiltshire SN3 1RE (GB)