(19)

(11)

EP 0 506 876 A1

(12)

(43) Date of publication: 07.10.1992 Bulletin 1992/41 (21) Application number: 91902840.0 (22) Date of filing: 17.12.1990

(51) International Patent Classification (IPC):  G03C 1/ 06( . ) G03C 1/ 34( . ) (86) International application number: PCT/US1990/007454 (87) International publication number: WO 1991/009345 (27.06.1991 Gazette 1991/14)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 18.12.1989 US 19890452847 (71) Applicant: INTERNATIONAL PAPER COMPANY Purchase New York 10577 (US)	(72) Inventor: ALTAVILLA, Alexander Vestal, NY 13850 (US) (74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät  Maximilianstrasse 58 D-80538 München D-80538 München (DE)