Patent US4525602A successfully refreshed from Google Patents.
Patent US3583468A successfully refreshed from Google Patents.
US3583468A
Expired / Lapsed
US
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Precision metal casting molds
Assignee: ChampionX LLC
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Filing: 1969-06-27
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Granted: 1971-06-08
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Expires: 1989-06-27
Abstract
Abstract A process for producing ceramic shell molds for use in the casting of metals which involves the steps of building up a ceramic shell mold by freezing a plurality of superimposed stuccoed layers onto an expandable pattern and removing the pattern by the application of heat.
Inventors
- 👤 Alan K Cutler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:02
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/165; B22C9/00; B22C9/12; B22C9/126
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
35 words
The process of claim 1 in which the granular refractory material is at least one member of the group consisting of fused silica, crystalline silica, zircon, mullite, alumina, calcined alumino-silicate, magnesia, chromia and magnesium silicate.
Claim 2
Dependent Claim
13 words
The process of claim 2 in which the refractory material is fused silica.
Claim 3
Dependent Claim
125 words
The process of producing a ceramic shell mold which comprises forming a ceramic shell by the steps of: a. Coating an expendable pattern with a ceramic slip comprising an aqueous alumina coated colloidal silica sol vehicle having a granular refractory material suspended therein, b. Stuccoing the coated pattern with a dry portion of said granular refractory material to form a stuccoed layer, c. Freezing the stuccoed layer at a temperature below +5* F., d. Forming a plurality of superimposed similar layers on the pattern to form a frozen ceramic shell, and e. Removing the pattern from the ceramic shell by heating the pattern to a temperature of at least 700* F. for a period of time sufficient to remove the pattern from the ceramic shell.
Claim 4
Dependent Claim
35 words
The process of claim 4 in which the granular refractory material is at least one member of the group consisting of fused silica, crystalline silica, zircon, mullite, alumina, calcined alumino-silicate, magnesia, chromia and magnesium silicate.
Claim 5
Dependent Claim
12 words
The process of claim 5 in which the refractory material is alumina.
References Cited (Backward Citations)
US2912729A
Cited
US3512571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |