(19)

(11)

EP 1 481 047 A1

(12)

(43) Date of publication: 01.12.2004 Bulletin 2004/49 (21) Application number: 03743408.1 (22) Date of filing: 27.02.2003

(51) International Patent Classification (IPC)7: C11D 1/94, C11D 3/02, C11D 3/20, C11D 17/00 (86) International application number: PCT/GB2003/000804 (87) International publication number: WO 2003/074643 (12.09.2003 Gazette 2003/37)

(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 SE SI SK TR Designated Extension States: AL LT LV MK RO (30) Priority: 01.03.2002 GB 0204781 (71) Applicant: Selden Research Ltd Buxton,Derbyshire SK17 9RZ (GB)	(72) Inventor: WOODHEAD, Peter StockportCheshire SK6 5PS (GB) (74) Representative: Wilson Gunn M'Caw  5th Floor,Blackfriars House,The Parsonage Manchester M3 2JA Manchester M3 2JA (GB)