(19)

(11)

EP 1 639 151 A1

(12)

(43) Date of publication: 29.03.2006 Bulletin 2006/13 (21) Application number: 04743071.5 (22) Date of filing: 24.06.2004

(51) International Patent Classification (IPC):  C23C 22/08(1985.01) C23C 22/74(1985.01) C23C 22/10(1985.01) C23C 22/36(1985.01) (86) International application number: PCT/GB2004/002720 (87) International publication number: WO 2005/001158 (06.01.2005 Gazette 2005/01)

(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 PL PT RO SE SI SK TR (30) Priority: 26.06.2003 GB 0314901 (71) Applicant: Natech Limited Stoke-on-Trent ST4 7SH (GB)	(72) Inventors: HARTOPP, Alison, Jane Stoke-on-Trent ST4 7SH (GB) FOSTER, Richard, Franklyn Stoke-on-Trent ST4 7SH (GB) (74) Representative: Sales, Robert Reginald  Swindell & Pearson, 48 Friar Gate Derby DE1 1GY Derby DE1 1GY (GB)