(19)

(11)

EP 0 420 902 A1

(12)

(43) Date of publication: 10.04.1991 Bulletin 1991/15 (21) Application number: 89907209.0 (22) Date of filing: 07.06.1989

(51) International Patent Classification (IPC):  F04D 1/ 12( . ) F04D 17/ 18( . ) (86) International application number: PCT/GB1989/000633 (87) International publication number: WO 1989/012170 (14.12.1989 Gazette 1989/29)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 10.06.1988 GB 19880013745 (71) Applicant: Genevac Limited Ipswich Suffolk IP1 5LU (GB)	(72) Inventor: COLE, Michael Suffolk IP6 0AH (GB) (74) Representative: Nash, Keith Wilfrid, et al  KEITH W. NASH & Co. Pearl Assurance House 90-92 Regent Street Cambridge CB2 1DP Cambridge CB2 1DP (GB)