(19)

(11)

EP 1 140 722 A1

(12)

(43) Date of publication: 10.10.2001 Bulletin 2001/41 (21) Application number: 99967971.5 (22) Date of filing: 15.12.1999

(51) International Patent Classification (IPC)7: C03C 17/36, E06B 5/16 (86) International application number: PCT/EP9910/183 (87) International publication number: WO 0037/383 (29.06.2000 Gazette 2000/26)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 18.12.1998 EP 98204318 (71) Applicant: GLAVERBEL 1170 Bruxelles (BE)	(72) Inventors: GOELFF, Pierre,Glaverbel 6040 Jumet (BE) DECROUPET, Daniel,Glaverbel 6040 Jumet (BE) (74) Representative: Farmer, Guy et al GLAVERBEL,Department of Intellectual Property,Centre R & D,Rue de l'Aurore 2 6040 Jumet 6040 Jumet (BE)