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(11)

EP 2 198 068 A1

(12)

(43) Date of publication: 23.06.2010 Bulletin 2010/25 (21) Application number: 07824827.5 (22) Date of filing: 05.10.2007

(51) International Patent Classification (IPC):  C23C 4/10(2006.01) C23C 26/00(2006.01) C03B 5/43(2006.01) C23C 24/08(2006.01) C03B 5/425(2006.01) (86) International application number: PCT/GB2007/050615 (87) International publication number: WO 2009/044090 (09.04.2009 Gazette 2009/15)

(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 MT NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (71) Applicant: Johnson Matthey Public Limited Company London EC1N 8EE (GB)	(72) Inventors: COUPLAND, Duncan, Roy Buckinghamshire HP11 1EA (GB) HILL, Rachel, Emma Yorkshire S6 4GL (GB) WILKINSON, Roger, Charles Cambridgeshire CB22 3HL (GB) (74) Representative: Whitcombe, Nicole Jane  Johnson Matthey Technology Centre Blount's Court Sonning Common Reading RG4 9NH Sonning Common Reading RG4 9NH (GB)