(19)

(11)

EP 0 843 601 A1

(12)

(43) Date of publication: 27.05.1998 Bulletin 1998/22 (21) Application number: 97926121.0 (22) Date of filing: 13.06.1997

(51) International Patent Classification (IPC):  B01D 29/ 01( . ) B07B 1/ 48( . ) B01D 33/ 00( . ) (86) International application number: PCT/GB1997/001607 (87) International publication number: WO 1997/047404 (18.12.1997 Gazette 1998/02)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 13.06.1996 GB 19960012372 21.06.1996 GB 19960013066 16.11.1996 GB 19960023831 (71) Applicant: ITS Holdings Limited New Malden, Surrey KT3 4AW (GB)	(72) Inventor: WOODBURN, William Edinburgh EH4 7QJ (GB) (74) Representative: Pattullo, Norman, et al  Murgitroyd and Company 373 Scotland Street Glasgow G5 8QA Glasgow G5 8QA (GB)