(19)

(11)

EP 0 809 715 A1

(12)

(43) Date of publication: 03.12.1997 Bulletin 1997/49 (21) Application number: 95911720.0 (22) Date of filing: 14.02.1995

(51) International Patent Classification (IPC):  C22C 1/ 02( . ) C22C 21/ 02( . ) C22C 21/ 00( . ) C22C 21/ 14( . ) (86) International application number: PCT/US1995/001843 (87) International publication number: WO 1996/025527 (22.08.1996 Gazette 1996/38)

(84) Designated Contracting States: DE FR GB (71) Applicant: CATERPILLAR INC. Peoria Illinois 61629 (US)	(72) Inventor: BOURKHINA, Anna N. Moscow, 123007 (RU) (74) Representative: Wagner, Karl H., Dipl.-Ing.  WAGNER & GEYER Patentanwälte Gewürzmühlstrasse 5 80538 München 80538 München (DE)