(19)

(11)

EP 1 092 051 A1

(12)

(43) Date of publication: 18.04.2001 Bulletin 2001/16 (21) Application number: 99955304.3 (22) Date of filing: 01.06.1999

(51) International Patent Classification (IPC)7: C23F 13/18, C23F 13/06 (86) International application number: PCT/GB9901/736 (87) International publication number: WO 9963/130 (09.12.1999 Gazette 1999/49)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 04.06.1998 GB 9812052 08.06.1998 GB 9812334 19.08.1998 GB 9818122 (71) Applicant: Atraverda Limited Staveley,Derbyshire S43 3JN (GB)	(72) Inventor: HILL, Andrew Staveley,Derbyshire S43 3JN (GB) (74) Representative: Shaw, Laurence  Laurence Shaw & Associates,5th Floor Metropolitan House,1 Hagley Road Edgbaston,Birmingham B16 8TG Edgbaston,Birmingham B16 8TG (GB)