Global Patent Index - EP 0747149 B1

EP 0747149 B1 2000-08-23 - Investment casting method yielding cast articles with enhanced surface finish

Title (en)

Investment casting method yielding cast articles with enhanced surface finish

Title (de)

Feingiessverfahren zur Erzeugung von Gegenständen mit sehr präziser Oberfläche

Title (fr)

Procédé de coulée de précision donnant des objets à état de surface de haute précision

Publication

EP 0747149 B1 (EN)

Application

EP 96304194 A

Priority

US 48104995 A

Abstract (en)

[origin: EP0747149A2] A modified investment casting process is provided which allows cast articles having a smooth surface finish to be obtained while using casting patterns made of a photocurable liquid polymer by a stereolithography process, or by molded thermoplastic materials. Moreover, the process of the invention eliminates or minimizes the incidence of mold cracking due to expansion of the casting pattern. The process involves first preparing a casting pattern through a stereolithography process or through molding a thermoplastic material. Thereafter, a wax or wax like coating is applied to the casting pattern and an investment assembly is prepared. A mold is obtained from the investment assembly by first subjecting the investment assembly to a first temperature range sufficient to melt and extract the wax or wax like material, leaving behind the casting pattern. Thereafter, the investment assembly is subjected to an elevated temperature in a second temperature range that is sufficient to melt and extract the casting pattern. <IMAGE>

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

B22C 7/02; B22C 9/04

IPC 8 full level (invention and additional information)

B22D 23/00 (2006.01); B22C 7/02 (2006.01); B22C 9/04 (2006.01); C08F 290/00 (2006.01); C08F 299/02 (2006.01)

CPC (invention and additional information)

B22C 9/043 (2013.01); B22C 7/023 (2013.01)

Designated contracting state (EPC)

DE FR GB IT

EPO simple patent family

EP 0747149 A2 19961211; EP 0747149 A3 19980408; EP 0747149 B1 20000823; AU 5459496 A 19961219; AU 708428 B2 19990805; DE 69609898 D1 20000928; DE 69609898 T2 20010222; JP 4059937 B2 20080312; JP H09136140 A 19970527

INPADOC legal status


2014-05-30 [PG25 IT] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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2014-03-28 [REG FR ST] NOTIFICATION OF LAPSE

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2014-03-27 [REG DE R119] APPLICATION DEEMED WITHDRAWN, OR IP RIGHT LAPSED, DUE TO NON-PAYMENT OF RENEWAL FEE

- Document: DE 69609898

- Effective date: 20140101

2014-02-26 [GBPC] GB: EUROPEAN PATENT CEASED THROUGH NON-PAYMENT OF RENEWAL FEE

- Effective date: 20130606

2012-09-28 [PGFP IT] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

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2012-07-31 [PGFP DE] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

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

2001-08-08 [26N] NO OPPOSITION FILED

2000-10-13 [ET] FR: TRANSLATION FILED

2000-10-06 [ITF] IT: TRANSLATION FOR A EP PATENT FILED

- Owner name: SOCIETA' ITALIANA BREVETTI S.P.A.

2000-09-28 [REF] CORRESPONDS TO:

- Document: DE 69609898 20000928

2000-08-23 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

- Designated State(s): DE FR GB IT

1999-05-06 [17Q] FIRST EXAMINATION REPORT

- Effective date: 19990323

1998-11-11 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19980911

1998-04-08 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A3

- Designated State(s): DE FR GB IT

1996-12-11 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

- Designated State(s): DE FR GB IT