(19)

(11)

EP 0 551 285 A1

(12)

(43) Date of publication: 21.07.1993 Bulletin 1993/29 (21) Application number: 91915304.0 (22) Date of filing: 16.08.1991

(51) International Patent Classification (IPC):  A61F 5/ 01( . ) A61F 13/ 06( . ) (86) International application number: PCT/US1991/005925 (87) International publication number: WO 1992/003110 (05.03.1992 Gazette 1992/06)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 17.08.1990 US 19900568750 (71) Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY St. Paul, Minnesota 55133-3427 (US)	(72) Inventors: FRANCE, E., Paul Salt Lake City, UT 84103 (US) PAULOS, Lonnie, E. Salt Lake City, UT 84103 (US) ELLINGSON, Richard, Lee Draper, UT 84020 (US) (74) Representative: Johnstone, Helen Margaret, et al  Urquhart-Dykes & Lord Tower House Merrion Way Leeds LS2 8PA Leeds LS2 8PA (GB)