Global Patent Index - EP 0869857 B1

EP 0869857 B1 2001-03-07 - PROCESS FOR MANUFACTURING HARD METAL PARTS

Title (en)

PROCESS FOR MANUFACTURING HARD METAL PARTS

Title (de)

VERFAHREN ZUR HERSTELLUNG VON HARTMETALLBAUTEILEN

Title (fr)

PROCEDE DE FABRICATION DE PIECES EN METAL DUR

Publication

EP 0869857 B1 (DE)

Application

EP 96942363 A

Priority

  • DE 19546901 A
  • EP 9605452 W

Abstract (en)

[origin: DE19546901C1] The invention relates to the field of the ceramic and hard metal industries and concerns a process for manufacturing hard metal parts, in particular those having a complex geometry, such as those used for example as machining tools and wear elements. The object of the invention is to create a process which allows the manufacture of hard metal parts with a complex geometry by using a stable dispersed hard metal-binder suspension, in which the binder is a thermoplastic binder having a viscosity of 3 to 6 mPas, and without using an organic solvent to eliminate the binder. For that purpose, a process is disclosed wherein a hard metal powder having an average corn size smaller than 2.0 mu m is mixed with a liquefied thermoplastic binder, the viscosity of the mixture being set upon a value of at least 100 mPas and up to 4000 mPas during the whole production and treatment process. The thus obtained stable disperse suspension is shaped into a moulded body from which the thermoplastic binder is then expelled and the binder-free shaped body is then sintered.

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

B22F 3/22; C22C 1/05

IPC 8 full level (invention and additional information)

B22F 3/22 (2006.01); C22C 1/05 (2006.01)

CPC (invention and additional information)

C22C 1/051 (2013.01); B22F 3/225 (2013.01)

Designated contracting state (EPC)

DE FR GB IT LU SE

EPO simple patent family

DE 19546901 C1 19970424; EP 0869857 A1 19981014; EP 0869857 B1 20010307; US 5972286 A 19991026; WO 9722427 A1 19970626

INPADOC legal status


2007-07-03 [PG25 DE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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- Effective date: 20070703

2006-02-21 [PGFP DE] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

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- Payment date: 20060221

- Year of fee payment: 10

2004-08-03 [EUG] SE: EUROPEAN PATENT HAS LAPSED

2003-12-06 [PG25 SE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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- Free text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

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2002-02-27 [26N] NO OPPOSITION FILED

2001-09-05 [GBV] GB: EP PATENT (UK) TREATED AS ALWAYS HAVING BEEN VOID IN ACCORDANCE WITH GB SECTION 77(7)/1977

- Effective date: 20010307

2001-08-03 [EN] FR: TRANSLATION NOT FILED

2001-04-12 [REF] CORRESPONDS TO:

- Document: DE 59606559 20010412

2001-03-07 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

- Designated State(s): DE FR GB IT LU SE

2001-03-07 [PG25 FR] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

- Ref Country Code: FR

- Free text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

- Effective date: 20010307

2001-03-07 [PG25 GB] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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- Free text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

- Effective date: 20010307

2001-03-07 [PG25 IT] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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- Free text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

- Effective date: 20010307

2000-07-05 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20000518

1998-10-14 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19980707

1998-10-14 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB IT LU SE