(19)

(11)

EP 0 925 114 A1

(12)

(43) Date of publication: 30.06.1999 Bulletin 1999/26 (21) Application number: 96926296.0 (22) Date of filing: 12.08.1996

(51) International Patent Classification (IPC):  B02C 13/ 18( . ) B02C 18/ 08( . ) B02C 18/ 06( . ) (86) International application number: PCT/CA1996/000544 (87) International publication number: WO 1998/006497 (19.02.1998 Gazette 1998/07)

(84) Designated Contracting States: BE DE DK ES FR IT SE (71) Applicant: Gupta, Rajendra P. Gloucester, Ontario K1J 8X4 (CA)	(72) Inventors: GUPTA, Rajendra P. Gloucester, Ontario K1J 8X4 (CA) WOOD, Grant W. Orleans, Ontario K1E 1W9 (CA) (74) Representative: Atkinson, Ralph, et al  Atkinson & Co., The Technology Park, Shirland Lane Sheffield S9 3PA Sheffield S9 3PA (GB)