(19)

(11)

EP 0 215 091 A1

(12)

(43) Date of publication: 25.03.1987 Bulletin 1987/13 (21) Application number: 86901962.0 (22) Date of filing: 24.03.1986

(51) International Patent Classification (IPC):  F04F 99/ 00( . ) F04F 13/ 00( . ) (86) International application number: PCT/GB1986/000169 (87) International publication number: WO 1986/005558 (25.09.1986 Gazette 1986/21)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 22.03.1985 GB 19850007540 (71) Applicant: UNIVERSITY OF BATH Claverton Down, Bath, BA2 7AY (GB)	(72) Inventor: PEARSON, Ronald, Denzil Bathford Bath BA1 7TZ (GB)