Patent US3552479A successfully refreshed from Google Patents.
US3552479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casting process involving cooling of a shell mold prior to casting metal therein
Assignee: MARTIN METALS CO
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Filing: 1967-11-22
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Granted: 1971-01-05
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Expires: 1987-11-22
Abstract
Abstract Method of precision casting of high temperature, nickel-base alloys in ceramic shell molds wherein, immediately prior to casting, a preheated shell mold is permitted to cool to provide a condition wherein there are substantial temperature differentials throughout the shell mold. Substantially enhanced characteristics are obtained in the resultant casting.
Inventors
- 👤 John Hockin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:22
CPC Classifications
B; B22; B22D; B22D18/00; B22D18/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
25 words
A process as in claim 1 wherein the refractory shell mold is made of zircon or alumina as is made by the lost wax process.
Claim 2
Dependent Claim
20 words
A process as in claim 1 wherein the refractory shell mold is cooled from about 3 to about 10 minutes.
Claim 3
Dependent Claim
22 words
A process as in claim 1 wherein the refractory shell mold encloses a volume in the shape of a gas turbine blade.
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |