(19)

(11)

EP 0 261 146 A1

(12)

(43) Date of publication: 30.03.1988 Bulletin 1988/13 (21) Application number: 87901151.0 (22) Date of filing: 29.01.1987

(51) International Patent Classification (IPC):  B01D 33/ 13( . ) D21F 1/ 66( . ) (86) International application number: PCT/SE1987/000039 (87) International publication number: WO 1987/004640 (13.08.1987 Gazette 1987/18)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 29.01.1986 SE 19860000379 (71) Applicant: CELLECO AB S-102 23 Stockholm (SE)	(72) Inventors: FRYKHULT, Rune, Helmer S-113 53 Stockholm (SE) NILSSON, Harry, Wilhelm CH-8274 Tägerwilen (CH)