(19)

(11)

EP 0 235 241 A1

(12)

(43) Date of publication: 09.09.1987 Bulletin 1987/37 (21) Application number: 86905443.0 (22) Date of filing: 26.08.1986

(51) International Patent Classification (IPC):  G01N 33/ 52( . ) G01N 33/ 72( . ) (86) International application number: PCT/NO1986/000060 (87) International publication number: WO 1987/001460 (12.03.1987 Gazette 1987/06)

(84) Designated Contracting States: BE GB IT NL SE (30) Priority: 30.08.1985 NO 19850003413 (71) Applicant: SILSAND, Terje N-3900 Porsgrunn (NO)	(72) Inventor: SILSAND, Terje N-3900 Porsgrunn (NO) (74) Representative: Roth, Ernst Adolf Michael, et al  GÖTEBORGS PATENTBYRA AB Box 5005 S-402 21 Göteborg S-402 21 Göteborg (SE)