(19)

(11)

EP 0 616 653 A1

(12)

(43) Date of publication: 28.09.1994 Bulletin 1994/39 (21) Application number: 93900137.0 (22) Date of filing: 10.12.1992

(51) International Patent Classification (IPC):  D06F 58/ 28( . ) (86) International application number: PCT/CA1992/000544 (87) International publication number: WO 1993/012284 (24.06.1993 Gazette 1993/15)

(84) Designated Contracting States: AT BE CH DE DK FR GB IT LI NL SE (30) Priority: 10.12.1991 GB 19910026200 09.04.1992 CA 19922065684 13.04.1992 US 19920867532 (71) Applicants: Hart, Douglas Robinson Sanford Toronto Ontario, M6G 1W9 (CA) JONES, David, M. Dundas, Ontario L9H 3N2 (CA)	(72) Inventors: Hart, Douglas Robinson Sanford Toronto Ontario, M6G 1W9 (CA) JONES, David, M. Dundas, Ontario L9H 3N2 (CA) (74) Representative: Godsill, John Kenneth  Haseltine Lake & Co. Hazlitt House 28 Southampton Buildings Chancery Lane London WC2A 1AT London WC2A 1AT (GB)