(19)

(11)

EP 0 469 093 A1

(12)

(43) Date of publication: 05.02.1992 Bulletin 1992/06 (21) Application number: 90908094.0 (22) Date of filing: 02.04.1990

(51) International Patent Classification (IPC):  C03B 5/ 04( . ) C03B 5/ 235( . ) C03B 5/ 183( . ) (86) International application number: PCT/SE1990/000214 (87) International publication number: WO 1990/012760 (01.11.1990 Gazette 1990/25)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI NL SE (30) Priority: 17.04.1989 SE 19890001382 (71) Applicant: AGA AKTIEBOLAG S-181 81 Lidingö (SE)	(72) Inventor: ANGEL, Richard S-112 24 Stockholm (SE) (74) Representative: Wiedemann, Bernd, et al  AGA AKTIEBOLAG Patent Department S-181 81 Lidingö S-181 81 Lidingö (SE)