(19)

(11)

EP 0 820 533 A1

(12)

(43) Date of publication: 28.01.1998 Bulletin 1998/05 (21) Application number: 96907022.0 (22) Date of filing: 30.01.1996

(51) International Patent Classification (IPC):  C22C 1/ 04( . ) C22C 26/ 00( . ) C22C 1/ 05( . ) (86) International application number: PCT/US1996/001342 (87) International publication number: WO 1996/023907 (08.08.1996 Gazette 1996/36)

(84) Designated Contracting States: BE DE FR GB IT (30) Priority: 01.02.1995 US 19950382468 18.12.1995 US 19950573715 (71) Applicant: KENNAMETAL INC. Latrobe, PA 15650 (US)	(72) Inventors: KELLEY, Harold, E. Fallon, NV 89406 (US) SILVIS, William, E. Austin, TX 78749 (US) TERRY, Charles, J. Fallon, NV 89406 (US) PETERSON, Gary, R. Fallon, NV 89406 (US) (74) Representative: Sulzbach, Werner, Dipl.-Chem. Dr., et al  Prinz & Partner, Manzingerweg 7 81241 München 81241 München (DE)