(19)

(11)

EP 1 009 531 A1

(12)

(43) Date of publication: 21.06.2000 Bulletin 2000/25 (21) Application number: 98930911.7 (22) Date of filing: 19.06.1998

(51) International Patent Classification (IPC)7: B02C 18/14, B02C 4/30 (86) International application number: PCT/GB9801/811 (87) International publication number: WO 9858/739 (30.12.1998 Gazette 1998/52)

(84) Designated Contracting States: DE DK ES FI FR GB IE IT SE (30) Priority: 23.06.1997 GB 9713163 26.09.1997 GB 9720390 (71) Applicant: MMD DESIGN & CONSULTANCY LIMITED Somercotes,Derbyshire DE55 4NJ (GB)	(72) Inventor: POTTS, Alan-MMD Design & Consultancy Limited Somercotes,Derbyshire DE55 4NJ (GB) (74) Representative: Dealtry, Brian  Eric Potter Clarkson,Park View House,58 The Ropewalk Nottingham NG1 5DD Nottingham NG1 5DD (GB)