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EP 0 475 976 A1

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(43) Date of publication: 25.03.1992 Bulletin 1992/13 (21) Application number: 90908446.0 (22) Date of filing: 07.06.1990

(51) International Patent Classification (IPC):  D21F( . ) D21F 1/ 00( . ) D21F 9/ 02( . ) D21F 1/ 52( . ) D21F 1/ 48( . ) (86) International application number: PCT/CA1990/000184 (87) International publication number: WO 1990/015186 (13.12.1990 Gazette 1990/28)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 08.06.1989 US 19890362925 (71) Applicant: JWI LIMITED Kanata Ontario K2K 1X2 (CA)	(72) Inventors: SMITH, David, Theodore Monson, MA 01057 (US) McPHERSON, Douglas, Robert East Longmeadow, MA 01028 (US) PITT, Richard, Edward Carleton Place, Ontario K7C 3W3 (CA) (74) Representative: Dipl.-Phys.Dr. Manitz Dipl.-Ing. Finsterwald Dipl.-Ing. Grämkow Dipl.Chem.Dr. Heyn Dipl.Phys. Rotermund Morgan, B.Sc.(Phys.)  Postfach 22 16 11 D-80506 München D-80506 München (DE)