(19)

(11)

EP 0 863 791 A1

(12)

(43) Date of publication: 16.09.1998 Bulletin 1998/38 (21) Application number: 96939178.0 (22) Date of filing: 20.11.1996

(51) International Patent Classification (IPC):  B01D 61/ 36( . ) B01D 71/ 02( . ) B01J 29/ 00( . ) B01D 63/ 06( . ) B01J 20/ 18( . ) B01J 35/ 02( . ) (86) International application number: PCT/GB1996/002861 (87) International publication number: WO 1997/018886 (29.05.1997 Gazette 1997/23)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 22.11.1995 GB 19950023854 (71) Applicants: Bratton, Graham John Sidcup, Kent DA15 8AL (GB) Naylor, Timothy De Villiers Englefield Green, Surrey TW2 0NQ (GB) Buck, Karon Doreen West Kingsdown, Kent TN15 6LH (GB)	(72) Inventors: Bratton, Graham John Sidcup, Kent DA15 8AL (GB) Naylor, Timothy De Villiers Englefield Green, Surrey TW2 0NQ (GB) Buck, Karon Doreen West Kingsdown, Kent TN15 6LH (GB) (74) Representative: Lucas, Brian Ronald  Lucas & Co. 135 Westhall Road Warlingham Surrey CR6 9HJ Warlingham Surrey CR6 9HJ (GB)