(19)

(11)

EP 0 216 843 A1

(12)

(43) Date of publication: 08.04.1987 Bulletin 1987/15 (21) Application number: 86901948.0 (22) Date of filing: 17.03.1986

(51) International Patent Classification (IPC):  F42B 5/ 30( . ) F42B 7/ 12( . ) F42B 7/ 08( . ) (86) International application number: PCT/GB1986/000154 (87) International publication number: WO 1986/005871 (09.10.1986 Gazette 1986/22)

(84) Designated Contracting States: AT DE FR GB IT SE (30) Priority: 27.03.1985 GB 19850007978 27.03.1985 GB 19850007979 27.03.1985 GB 19850007980 (71) Applicant: SCIENTIFIC CARTRIDGE DEVELOPMENTS LIMITED London W1 (GB)	(72) Inventor: CROWCROFT, Peter, Lester Minera, Nr. Wrexham Clwyd (GB) (74) Representative: Warden, John Christopher  R.G.C. Jenkins & Co. 12-15, Fetter Lane London EC4A 1PL London EC4A 1PL (GB)