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(11)

EP 1 357 797 A1

(12)

(43) Date of publication: 05.11.2003 Bulletin 2003/45 (21) Application number: 02715518.3 (22) Date of filing: 18.01.2002

(51) International Patent Classification (IPC)7: A22B 3/00, H05C 1/00 (86) International application number: PCT/GB0200/210 (87) International publication number: WO 0205/8475 (01.08.2002 Gazette 2002/31)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 23.01.2001 GB 0101748 (71) Applicant: UNIVERSITY OF BRISTOL CliftonBristol BS8 1TH (GB)	(72) Inventors: ANIL, Mehmet, Haluk Congresbury BS49 5BG (GB) BUTLER, Stuart, Raymond Portishead BS20 8EF (GB) (74) Representative: Beck, Simon Antony et al Withers & RogersGoldings House2 Hays Lane London SE1 2HW London SE1 2HW (GB)