Global Patent Index - EP 0726823 B1

EP 0726823 B1 2000-06-28 - PROCESS FOR FORMING HOLLOW STEPPED SHAFTS OF COLD-FORMABLE METAL BY INTERNAL HIGH PRESSURE

Title (en)

PROCESS FOR FORMING HOLLOW STEPPED SHAFTS OF COLD-FORMABLE METAL BY INTERNAL HIGH PRESSURE

Title (de)

VERFAHREN ZUM INNENHOCHDRUCK-UMFORMEN VON HOHLEN, ABGESETZTEN WELLEN AUS KALTUMFORMBAREM METALL

Title (fr)

PROCEDE POUR LE FORMAGE PAR HAUTE PRESSION INTERNE D'ARBRES CREUX ETAGES EN METAL FACONNABLE A FROID

Publication

EP 0726823 B1 (DE)

Application

EP 95900062 A

Priority

  • DE 9401300 W
  • DE 4337517 A

Abstract (en)

[origin: US5802899A] PCT No. PCT/DE94/01300 Sec. 371 Date Jul. 12, 1996 Sec. 102(e) Date Jul. 12, 1996 PCT Filed Nov. 3, 1994 PCT Pub. No. WO95/12466 PCT Pub. Date May 11, 1995The invention relates to a process for forming hollow stepped shafts of cold-formable metal by internal high pressure with the following steps: provision of a tube outlet section and filling it with fluid; sealing at least the tube section to be widened; application of a suitable high internal pressure for widening the tube section; calibration of the workpiece by applying a high calibration pressure; maintenance of the calibration pressure while heading the tube along the longitudinal axis. Internal tools, also spring-loaded tools, are provided as supports in the tool.

IPC 1-7 (main, further and additional classification)

B21D 26/02

IPC 8 full level (invention and additional information)

B21D 26/02 (2011.01); B21D 26/033 (2011.01)

CPC (invention and additional information)

B21D 26/033 (2013.01)

Designated contracting state (EPC)

AT BE DE ES FR GB IT NL SE

EPO simple patent family

US 5802899 A 19980908; AT 194092 T 20000715; CA 2175822 A1 19950511; CN 1057029 C 20001004; CN 1134124 A 19961023; DE 4337517 A1 19950504; EP 0726823 A1 19960821; EP 0726823 B1 20000628; ES 2147279 T3 20000901; JP H09504478 A 19970506; WO 9512466 A1 19950511

INPADOC legal status


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2002-01-01 [REG GB IF02] EUROPEAN PATENT IN FORCE AS OF 2002-01-01

2001-06-13 [26N] NO OPPOSITION FILED

2001-02-14 [REG GB 732E] AMENDMENTS TO THE REGISTER IN RESPECT OF CHANGES OF NAME OR CHANGES AFFECTING RIGHTS (SECT. 32/1977)

2000-12-01 [NLV1] NL: LAPSED OR ANNULLED DUE TO FAILURE TO FULFILL THE REQUIREMENTS OF ART. 29P AND 29M OF THE PATENTS ACT

2000-11-15 [RAP2] TRANSFER OF RIGHTS OF AN EP GRANTED PATENT

- Owner name: MAGNA IHV GESELLSCHAFT FUER INNENHOCHDRUCKVERFAHRE

2000-09-19 [ITF] IT: TRANSLATION FOR A EP PATENT FILED

- Owner name: STUDIO TORTA S.R.L.

2000-09-01 [REG ES FG2A] DEFINITIVE PROTECTION

- Document: ES 2147279 T3

2000-08-11 [ET] FR: TRANSLATION FILED

2000-08-03 [REF] CORRESPONDS TO:

- Document: DE 59409414 20000803

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2000-06-07 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: MAGNA IHV GESELLSCHAFT FUER INNENHOCHDRUCKVERFAHRE

2000-06-07 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: WEBER, GEORG

2000-06-07 [RIN1] INVENTOR (CORRECTION)

- Inventor name: KLAAS, FRIEDRICH

2000-06-07 [RIN1] INVENTOR (CORRECTION)

- Inventor name: BOEGEL, HELMUT

2000-06-07 [RIN1] INVENTOR (CORRECTION)

- Inventor name: WEBER, GEORG

1997-01-29 [17Q] FIRST EXAMINATION REPORT

- Effective date: 19961217

1996-08-21 [17P] REQUEST FOR EXAMINATION FILED

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