(19)

(11)

EP 0 466 794 A1

(12)

(43) Date of publication: 22.01.1992 Bulletin 1992/04 (21) Application number: 90906313.0 (22) Date of filing: 06.04.1990

(51) International Patent Classification (IPC):  A61L 15/ 26( . ) B01D 67/ 00( . ) A61L 15/ 42( . ) C08J 9/ 28( . ) (86) International application number: PCT/GB1990/000531 (87) International publication number: WO 1990/011820 (18.10.1990 Gazette 1990/24)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 06.04.1989 GB 19890007740 (71) Applicant: BEAMTECH LIMITED Tarvin, Chester. CH3 8JF (GB)	(72) Inventors: GILDING, Dennis, Keith Cheshire CW7 4DL (GB) IVES, Christopher, Louis Nantwich Cheshire CW5 8QA (GB) GALUSZA, Mark, Michael Cheshire CH3 8EU (GB) DIXON, Simon, Ashley Liverpool L14 3NP (GB) MIDDLETON, Ian, Philip Cheshire CH3 5RL (GB) (74) Representative: Laufhütte, Dieter, Dr.-Ing., et al  Lorenz-Seidler-Gossel Widenmayerstrasse 23 D-80538 München D-80538 München (DE)