(19)

(11)

EP 1 005 614 A1

(12)

(43) Date of publication: 07.06.2000 Bulletin 2000/23 (21) Application number: 98939761.7 (22) Date of filing: 20.08.1998

(51) International Patent Classification (IPC)7: F04D 13/02 (86) International application number: PCT/GB9802/500 (87) International publication number: WO 9910/655 (04.03.1999 Gazette 1999/09)

(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: 23.08.1997 GB 9717866 (71) Applicant: CONCENTRIC PUMPS LIMITED Birmingham B24 8HW (GB)	(72) Inventor: TEBBY, Stephen Walker Leamington Spa,Warwickshire CV31 1JS (GB) (74) Representative: Barnfather, Karl Jon, Dr. et al Withers & Rogers,Goldings House,2 Hays Lane London SE1 2HW London SE1 2HW (GB)