(19)

(11)

EP 0 493 458 A1

(12)

(43) Date of publication: 08.07.1992 Bulletin 1992/28 (21) Application number: 90914113.0 (22) Date of filing: 18.09.1990

(51) International Patent Classification (IPC):  D03D 1/ 00( . ) D21F 1/ 00( . ) D03D 15/ 00( . ) D21F 7/ 08( . ) (86) International application number: PCT/CA1990/000304 (87) International publication number: WO 1991/004374 (04.04.1991 Gazette 1991/08)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 19.09.1989 US 19890409163 (71) Applicant: JWI LIMITED Kanata Ontario K2K 1X2 (CA)	(72) Inventor: JACKSON, Graham, William Carleton Place, Ontario K7C 3P2 (CA) (74) Representative: Morgan, James G.  Manitz, Finsterwald & Rotermund Patentanwälte Postfach 22 16 11 D-80506 München D-80506 München (DE)