(19)

(11)

EP 2 566 812 A1

(12)

(43) Date of publication: 13.03.2013 Bulletin 2013/11 (21) Application number: 11754714.1 (22) Date of filing: 06.05.2011

(51) International Patent Classification (IPC):  C01B 31/08(2006.01) A24D 3/16(2006.01) (86) International application number: PCT/GB2011/050882 (87) International publication number: WO 2011/148156 (01.12.2011 Gazette 2011/48)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 07.05.2010 GB 201007667 (71) Applicant: British American Tobacco (Investments) Ltd London, WC2R 3LA (GB)	(72) Inventors: BRANTON, Peter London WC2R 3LA (GB) DAWSON, Elizabeth Queensgate Huddersfield HD1 3DH (GB) PARKES, Gareth Queensgate Huddersfield HD1 3DH (GB) (74) Representative: Gill, Siân Victoria et al Venner Shipley LLP 200 Aldersgate London EC1A 4HD London EC1A 4HD (GB)