(19)

(11)

EP 0 505 432 A1

(12)

(43) Date of publication: 30.09.1992 Bulletin 1992/40 (21) Application number: 91900994.0 (22) Date of filing: 12.12.1990

(51) International Patent Classification (IPC):  G01N 15/ 05( . ) (86) International application number: PCT/SE1990/000824 (87) International publication number: WO 1991/009295 (27.06.1991 Gazette 1991/14)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 13.12.1989 SE 19890004207 (71) Applicant: TESI AB S-114 56 Stockholm (SE)	(72) Inventors: ERIKSSON, Sven, E. S-112 33 Stockholm (SE) SILANDER, Torsten S-114 56 Stockholm (SE) (74) Representative: Örtenblad, Bertil Tore  Noréns Patentbyra AB Box 27034 S-102 51 Stockholm S-102 51 Stockholm (SE)