(19)

(11)

EP 0 674 603 A1

(12)

(43) Date of publication: 04.10.1995 Bulletin 1995/40 (21) Application number: 94902077.0 (22) Date of filing: 14.12.1993

(51) International Patent Classification (IPC):  C02F 1/ 34( . ) (86) International application number: PCT/GB1993/002547 (87) International publication number: WO 1994/013587 (23.06.1994 Gazette 1994/14)

(84) Designated Contracting States: DE FR GB IT SE (30) Priority: 16.12.1992 GB 19920026258 (71) Applicant: GEC ALSTHOM LIMITED Rugby Warwickshire CV21 1TB (GB)	(72) Inventors: REECE, Michael, Peter London SW13 9QH (GB) WHEELER, David, John Leicester LE2 4TS (GB) (74) Representative: Hoste, Colin Francis  The General Electric Company p.l.c. GEC Patent Department Waterhouse Lane Chelmsford, Essex CM1 2QX Chelmsford, Essex CM1 2QX (GB)