(19)

(11)

EP 0 424 433 A1

(12)

(43) Date of publication: 02.05.1991 Bulletin 1991/18 (21) Application number: 89907862.0 (22) Date of filing: 16.06.1989

(51) International Patent Classification (IPC):  A01N 3/ 02( . ) (86) International application number: PCT/SE1989/000352 (87) International publication number: WO 1989/012391 (28.12.1989 Gazette 1989/30)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 16.06.1988 SE 19880000154 (71) Applicant: Norström, Erik S-725 92 Västeras (SE)	(72) Inventor: Norström, Erik S-725 92 Västeras (SE) (74) Representative: Wibom, Hans Sven Erik, et al  Dr. Ludwig Brann Patentbyra AB P.O. Box 17192 S-104 62 Stockholm S-104 62 Stockholm (SE)