(19)

(11)

EP 1 940 742 A1

(12)

(43) Date of publication: 09.07.2008 Bulletin 2008/28 (21) Application number: 06779296.0 (22) Date of filing: 05.09.2006

(51) International Patent Classification (IPC):  C01G 23/04(2006.01) C01G 23/08(2006.01) C01G 23/053(2006.01) C09C 1/36(2006.01) (86) International application number: PCT/GB2006/003277 (87) International publication number: WO 2007/028972 (15.03.2007 Gazette 2007/11)

(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 (30) Priority: 06.09.2005 GB 0518139 (71) Applicant: CAMBRIDGE UNIVERSITY TECHNICAL SERVICES LIMITED Cambridge, CB2 1QA (GB)	(72) Inventors: EDER, Dominik Cambridge CB3 0FY (GB) KINLOCH, Ian, A. Cambridge CB4 9XU (GB) WINDLE, Alan, H. Cambridge CB3 0DP (GB) (74) Representative: Smart, Peter John  Beck Greener Fulwood House, 12 Fulwood Place, London WC1V 6HR London WC1V 6HR (GB)