(19)

(11)

EP 1 131 268 A1

(12)

(43) Date of publication: 12.09.2001 Bulletin 2001/37 (21) Application number: 99969215.5 (22) Date of filing: 05.11.1999

(51) International Patent Classification (IPC)7: C03C 17/36, C03C 17/34 (86) International application number: PCT/EP9908/691 (87) International publication number: WO 0029/346 (25.05.2000 Gazette 2000/21)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 06.11.1998 EP 98203749 (71) Applicant: GLAVERBEL 1170 Bruxelles (BE)	(72) Inventor: Degand, Etienne 6040 Jumet (BE) (74) Representative: Farmer, Guy  GLAVERBEL,Department of Intellectual Property,Centre R & D,Rue de l'Aurore 2 6040 Jumet 6040 Jumet (BE)