(19)

(11)

EP 0 569 448 A1

(12)

(43) Date of publication: 18.11.1993 Bulletin 1993/46 (21) Application number: 92904055.0 (22) Date of filing: 28.01.1992

(51) International Patent Classification (IPC):  C21C 5/ 28( . ) C21C 5/ 30( . ) C21C 5/ 00( . ) C21C 7/ 068( . ) (86) International application number: PCT/SE1992/000053 (87) International publication number: WO 1992/013975 (20.08.1992 Gazette 1992/22)

(84) Designated Contracting States: AT BE DE ES FR GB IT SE (30) Priority: 31.01.1991 SE 19910000294 (71) Applicant: AGA AKTIEBOLAG S-181 81 Lidingö (SE)	(72) Inventor: BRUNNER, Mikael S-183 30 Täby (SE) (74) Representative: Wiedemann, Bernd  AGA AKTIEBOLAG Patent Department S-181 81 Lidingö S-181 81 Lidingö (SE)