(19)

(11)

EP 1 608 456 A1

(12)

(43) Date of publication: 28.12.2005 Bulletin 2005/52 (21) Application number: 03782616.1 (22) Date of filing: 11.12.2003

(51) International Patent Classification (IPC)7: B01D 53/86 (86) International application number: PCT/GB2003/005415 (87) International publication number: WO 2004/052513 (24.06.2004 Gazette 2004/26)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR Designated Extension States: AL LT LV MK (30) Priority: 11.12.2002 GB 0228810 (71) Applicant: Ceimig Limited Kilmarnock,Ayrshire KA3 2PA (GB)	(72) Inventor: THOMSON, James Dundee DD3 3JQ (GB) (74) Representative: Wilson, Gary  Marks & Clerk Scotland 19 Royal Exchange Square Glasgow G1 3AE Glasgow G1 3AE (GB)