(19)

(11)

EP 0 398 972 A1

(12)

(43) Date of publication: 28.11.1990 Bulletin 1990/48 (21) Application number: 89902406.0 (22) Date of filing: 09.02.1989

(51) International Patent Classification (IPC):  F01B 9/ 02( . ) F02B 75/ 28( . ) F02B 75/ 00( . ) F02B 75/ 02( . ) (86) International application number: PCT/GB1989/000123 (87) International publication number: WO 1989/007704 (24.08.1989 Gazette 1989/20)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 10.02.1988 GB 19880003061 (71) Applicant: May, Claude Hector Bath Avon BA1 7ES (GB)	(72) Inventor: May, Claude Hector Bath Avon BA1 7ES (GB) (74) Representative: Gordon, Michael Vincent, et al  GILL JENNINGS & EVERY, Broadgate House, 7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)