US4732204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of ceramic cores
Assignee: Safran Aircraft Engines SAS
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Filing: 1987-02-26
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Granted: 1988-03-22
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Expires: 2007-02-26
Abstract
Abstract A process is disclosed for the preparation of ceramic cores which includes injection by means of a press of low power of liquid wax into cavities of a ceramic core disposed in a mould of elastomer produced by moulding of a dummy core which is a replica of the core to be produced.
Inventors
- 👤 Jacky P. Tabardin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:48
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/18; B22C7/00; B22C7/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
73 words
A process for the production of ceramic cores intended for the casting of high precision parts by the lost wax method, the process comprising the steps of: (a) providing a core having cavities therein, (b) providing a flexible mould, (c) filling by means of an injection moulding machine, the cavities of the core with modelling wax while the core is enclosed within the flexible mould, and (d) enrobing the core with modelling wax.
Claim 2
Dependent Claim
73 words
A process for the production of ceramic cores intended for the casting of high precision parts by the lost wax method, the process comprising the steps of: (a) providing a core having cavities therein, (b) providing a flexible mould, (c) filling by means of an injection moulding machine, the cavities of the core with modelling wax while the core is enclosed within the flexible mould, and (d) enrobing the core with modelling wax.
Claim 3
Dependent Claim
38 words
A process according to claim 1, wherein the flexible mould is of a silicone elastomer and is produced with the aid of a dummy core of a shape identical to that of the said core to be produced.
Claim 4
Dependent Claim
47 words
A process according to claim 1, wherein the injection pressure of the injection moulding machine is controlled to lie in the range 1 to 5 bars and a clamping pressure matched to the injection pressure of the machine is applied to the mould during the moulding operation.
Claim 5
Dependent Claim
47 words
A process according to claim 2, wherein the injection pressure of the injection moulding machine is controlled to lie in the range 1 to 5 bars and a clamping pressure matched to the injection pressure of the machine is applied to the mould during the moulding operation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |