(19)

(11)

EP 0 942 783 A1

(12)

(43) Date of publication: 22.09.1999 Bulletin 1999/38 (21) Application number: 97910643.0 (22) Date of filing: 21.10.1997

(51) International Patent Classification (IPC):  B02C 17/ 10( . ) B02C 17/ 14( . ) (86) International application number: PCT/NZ1997/000140 (87) International publication number: WO 1998/017392 (30.04.1998 Gazette 1998/17)

(84) Designated Contracting States: DE FI GB SE (30) Priority: 23.10.1996 NZ 19960299629 (71) Applicant: Rocklabs Limited Auckland 1006 (NZ)	(72) Inventor: DEVEREUEX, Ian Auckland 1701 (NZ) (74) Representative: Green, Mark Charles, et al  Urquhart-Dykes & Lord, 91 Wimpole Street London W1M 8AH London W1M 8AH (GB)