(19)

(11)

EP 0 484 398 A1

(12)

(43) Date of publication: 13.05.1992 Bulletin 1992/20 (21) Application number: 90911505.0 (22) Date of filing: 24.07.1990

(51) International Patent Classification (IPC):  D21H 21/ 28( . ) D21H 17/ 67( . ) D21C 9/ 00( . ) D21H 17/ 70( . ) (86) International application number: PCT/US1990/004138 (87) International publication number: WO 1991/001409 (07.02.1991 Gazette 1991/04)

(84) Designated Contracting States: AT DE FR GB NL SE (30) Priority: 24.07.1989 US 19890384992 (71) Applicant: THE BOARD OF REGENTS OF THE UNIVERSITY OF WASHINGTON Seattle, Washington 98195 (US)	(72) Inventor: ALLAN, G., Graham Seattle, WA 98155 (US) (74) Representative: Huber, Bernhard, Dipl.-Chem.  Patentanwälte H. Weickmann, Dr. K. Fincke F.A. Weickmann, B. Huber Dr. H. Liska, Dr. J. Prechtel, Dr. B. Böhm Postfach 86 08 20 D-81635 München D-81635 München (DE)