(19)

(11)

EP 0 473 660 A1

(12)

(43) Date of publication: 11.03.1992 Bulletin 1992/11 (21) Application number: 90908254.0 (22) Date of filing: 24.05.1990

(51) International Patent Classification (IPC):  A61F 13/ 15( . ) (86) International application number: PCT/GB1990/000812 (87) International publication number: WO 1990/014061 (29.11.1990 Gazette 1990/27)

(84) Designated Contracting States: BE DE DK ES FR GB IT NL SE (30) Priority: 24.05.1989 GB 19890011958 23.03.1990 GB 19900006545 (71) Applicant: ALLIED COLLOIDS LIMITED Bradford, West Yorkshire BD12 0JZ (GB)	(72) Inventor: MARSHALL, David West Yorkshire WF14 9NJ (GB) (74) Representative: Jones, Helen Marjorie Meredith  Gill Jennings & Every, Broadgate House, 7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)