(19)

(11)

EP 0 873 541 A1

(12)

(43) Date of publication: 28.10.1998 Bulletin 1998/44 (21) Application number: 96944431.0 (22) Date of filing: 19.12.1996

(51) International Patent Classification (IPC):  G03D 5/ 00( . ) (86) International application number: PCT/US1996/020097 (87) International publication number: WO 1997/025652 (17.07.1997 Gazette 1997/31)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 09.01.1996 GB 19960000372 (71) Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY St. Paul, Minnesota 55133-3427 (US)	(72) Inventor: LEONARD, Mark, T. Saint Paul, MN 55133-3427 (US) (74) Representative: Bowman, Paul Alan, et al  LLOYD WISE, TREGEAR & CO., Commonwealth House, 1-19 New Oxford Street London WC1A 1LW London WC1A 1LW (GB)