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(11)

EP 1 089 838 A1

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(43) Date of publication: 11.04.2001 Bulletin 2001/15 (21) Application number: 99930744.0 (22) Date of filing: 24.06.1999

(51) International Patent Classification (IPC)7: B21H 1/10, B21D 53/30, C22F 1/04, B21K 1/38 (86) International application number: PCT/US9914/457 (87) International publication number: WO 9967/042 (29.12.1999 Gazette 1999/52)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 24.06.1998 RU 98111967 (71) Applicants: GENERAL ELECTRIC COMPANY Schenectady, NY 12345 (US) Institute for Metals Superplasticity Problems of the Russian Academy of Sciences Bashkortostan, 450001 (RU)	(72) Inventors: UTYASHEV, Farid Zainullaevich Bashkortostan,Ufa 450096 (RU) KAIBYSHEV, Oscar Akamovich Bashkortostan,Ufa 450005 (RU) TRIFONOV, Vadim Gennadievich Bashkortostan,Ufa 450059 (RU) (74) Representative: Goode, Ian Roy  London Patent OperationGeneral Electric International, Inc.Essex House12-13 Essex Street London WC2R 3AA London WC2R 3AA (GB)