(19)

(11)

EP 0 245 351 A1

(12)

(43) Date of publication: 19.11.1987 Bulletin 1987/47 (21) Application number: 86906473.0 (22) Date of filing: 23.10.1986

(51) International Patent Classification (IPC):  G01L 5/ 10( . ) (86) International application number: PCT/NO1986/000073 (87) International publication number: WO 1987/003087 (21.05.1987 Gazette 1987/11)

(84) Designated Contracting States: DE FR GB SE (30) Priority: 14.11.1985 NO 19850004553 (71) Applicant: PAPIRINDUSTRIENS FORSKNINGSINSTITUTT N-0319 Oslo 3 (NO)	(72) Inventor: HANSEN, A oge N-0667 Oslo 3 (NO)