(19)

(11)

EP 0 157 807 A1

(12)

(43) Date of publication: 16.10.1985 Bulletin 1985/42 (21) Application number: 84903439.0 (22) Date of filing: 14.09.1984

(51) International Patent Classification (IPC):  C14B 1/ 28( . ) C14B 1/ 56( . ) (86) International application number: PCT/DK1984/000088 (87) International publication number: WO 1985/001299 (28.03.1985 Gazette 1985/08)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 16.09.1983 DK 19830004234 (71) Applicant: NORDISK LAEDERFORSKNINGSRAD TEKNOLOGISK INSTITUT DK-2630 Tastrup (DK)	(72) Inventor: AHLUND, Christer SE-512 01 Svenljunga 1 (SE)