(19)

(11)

EP 1 082 521 A1

(12)

(43) Date of publication: 14.03.2001 Bulletin 2001/11 (21) Application number: 99923731.6 (22) Date of filing: 21.05.1999

(51) International Patent Classification (IPC)7: F01C 1/44 (86) International application number: PCT/GB9901/419 (87) International publication number: WO 9961/752 (02.12.1999 Gazette 1999/48)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 23.05.1998 GB 9811111 (71) Applicant: Driver Technology Limited Shepshed,Leicestershire LE12 9ZP (GB)	(72) Inventor: DRIVER, Ronald William Clitheroe,Lancs. BB7 4JY (GB) (74) Representative: Ajello, Michael John  Urquhart-Dykes & LordGreg's Buildings1 Booth Street Manchester M2 4DU Manchester M2 4DU (GB)