(19)

(11)

EP 0 636 057 A1

(12)

(43) Date of publication: 01.02.1995 Bulletin 1995/05 (21) Application number: 93907085.0 (22) Date of filing: 01.03.1993

(51) International Patent Classification (IPC):  B24D 3/ 34( . ) B24D 11/ 00( . ) B24D 3/ 00( . ) (86) International application number: PCT/US1993/001789 (87) International publication number: WO 1993/020976 (28.10.1993 Gazette 1993/26)

(84) Designated Contracting States: DE ES FR GB IT (30) Priority: 13.04.1992 US 19920868007 (71) Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY St. Paul, Minnesota 55133-3427 (US)	(72) Inventors: LINDHOLM, Gene, O. Saint Paul, MN 55133-3427 (US) STERNER, Mark, L. Saint Paul, MN 55133-3427 (US) TOCCI, Theodore, C. Saint Paul, MN 55133-3427 (US) (74) Representative: VOSSIUS & PARTNER  Siebertstrasse 4 D-81675 München D-81675 München (DE)