(19)

(11)

EP 0 491 700 A1

(12)

(43) Date of publication: 01.07.1992 Bulletin 1992/27 (21) Application number: 90908443.0 (22) Date of filing: 30.05.1990

(51) International Patent Classification (IPC):  G21C 11/ 04( . ) G21D 9/ 00( . ) G21C 15/ 18( . ) (86) International application number: PCT/CA1990/000175 (87) International publication number: WO 1991/004559 (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: 15.09.1989 CA 19890611549 (71) Applicant: ECS-POWER SYSTEMS INC. Ottawa, Ontario K1S 5A3 (CA)

(72) Inventors: HEWITT, John, S. Ottawa, Ontario K1N 6R4 (CA) AJUS, Hani, C. Orleans, Ontario K4A 2R9 (CA) JAMIESON, Terrance, J. Ottawa, Ontario K2C 2B1 (CA) OLIVA, Antonino, F. Ottawa, Ontario K2C 2H4 (CA) PEARSON, Bruce, M. Kanata, Ontario K2L 3A6 (CA) WONG, William, P. Nepean, Ontario K2J 2A5 (CA) (74) Representative: Rottmann, Maximilian R.  c/o Rottmann, Zimmermann + Partner AG Glattalstrasse 37 CH-8052 Zürich CH-8052 Zürich (CH)