(19)

(11)

EP 0 456 763 A1

(12)

(43) Date of publication: 21.11.1991 Bulletin 1991/47 (21) Application number: 90903804.0 (22) Date of filing: 01.02.1990

(51) International Patent Classification (IPC):  G01N 25/ 18( . ) G01N 33/ 72( . ) G01R 22/ 04( . ) G01N 21/ 17( . ) G01R 21/ 02( . ) G01R 29/ 08( . ) (86) International application number: PCT/EP1990/000211 (87) International publication number: WO 1990/008952 (09.08.1990 Gazette 1990/19)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 03.02.1989 GB 19890002415 (71) Applicants: HOLMES, Michael John London WC2B 6UZ (GB) AB VARILAB S-141 44 Huddinge (SE)	(72) Inventors: HELANDER, Per, Olof, Folkesson S-141 44 Huddinge (SE) LUNDSTRÖM, Kurt, Ingemar S-582 52 Linköping (SE) (74) Representative: Holmes, Michael John, et al  Frank B. Dehn & Co. Imperial House 15-19 Kingsway London WC2B 6UZ London WC2B 6UZ (GB)