(19)

(11)

EP 0 724 484 A1

(12)

(43) Date of publication: 07.08.1996 Bulletin 1996/32 (21) Application number: 94931225.0 (22) Date of filing: 18.10.1994

(51) International Patent Classification (IPC):  B02C 13/ 14( . ) B02C 13/ 18( . ) (86) International application number: PCT/NZ1994/000111 (87) International publication number: WO 1995/011086 (27.04.1995 Gazette 1995/18)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 22.10.1993 NZ 19930250027 (71) Applicant: BARMAC ASSOCIATES LIMITED Mount Eden, Auckland (NZ)	(72) Inventor: BARTLEY, Bryan Allen, 625 Mount Eden Road Auckland (NZ) (74) Representative: Johnson, Terence Leslie, et al  Edward Evans & Co. Chancery House 53-64 Chancery Lane London WC2A 1SD London WC2A 1SD (GB)