(19)

(11)

EP 1 861 522 A2

(12)

(88) Date of publication A3: 28.06.2007 (43) Date of publication: 05.12.2007 Bulletin 2007/49 (21) Application number: 06710171.7 (22) Date of filing: 14.03.2006

(51) International Patent Classification (IPC):  C23F 13/16(2006.01) (86) International application number: PCT/GB2006/050054 (87) International publication number: WO 2006/097770 (21.09.2006 Gazette 2006/38)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK YU (30) Priority: 16.03.2005 GB 0505353 04.10.2005 GB 0520112 13.01.2006 GB 0600661 (71) Applicants: Glass, Gareth Lichfield Staffordshire WS14 9DQ (GB) Roberts, Adrian Nottingham, Notts NG9 5HG (GB) Davison, Nigel Swadlincote, Derbyshire DE12 8DG (GB)

(72) Inventors: Glass, Gareth Lichfield Staffordshire WS14 9DQ (GB) Roberts, Adrian Nottingham, Notts NG9 5HG (GB) Davison, Nigel Swadlincote, Derbyshire DE12 8DG (GB)