Patent US3576653A successfully refreshed from Google Patents.
US3576653A
Expired / Lapsed
US
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Leachable ceramic core
Assignee: Motors Liquidation Co
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Filing: 1967-10-20
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Granted: 1971-04-27
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Expires: 1987-10-20
Abstract
Abstract THE TERNARY CALCIUM OXIDE BASE COMPOSITIONS, CAO,AL2O3,SIO2 AND 2CAO,AL2O3.SIO2, FORM STRONG SINTERED CORE BODIES WHICH ARE READILY LEACHABLE WITH WATER AND DILUTE HYDROCHLORIC ACIDS. THE TERNARY CALCIUM OXIDE BASED COMPOSITIONS ARE FORMED PREFERABLY BY REACTING CALCIUM CARBONATE, ALUMINA, AND FUSED SILICA AT AN ELVEATED TEMPERATURE. THE TERNARY CALCIUM OXIDE BASED COMPOSITION IS GROUND AND SHAPED INTO A CORE BODY WHICH IS SUBSEQUENTLY SINTERED.
Inventors
- 👤 Donald G Miller
- 👤 Richard H Singleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:56
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/10; B22C9/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |