US3764305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of storage and heat retaining for treated nodular cast iron
Assignee: ABB AB
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Filing: 1971-02-25
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Granted: 1973-10-09
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Expires: 1991-02-25
Abstract
Abstract NODULAR CAST IRON TREATED WITH AN ALLOYING MEDIUM CONTAINING MAGNESIUM IS POURED INTO AN INLET OF A DOUBLECROSSED INDUCTION FURNACE, THE INLET AND OUTLET CHANNELS OF WHICH ARE SEALED BY THE MELT, FORMING A CLOSED SPACE ABOVE THE MELT FROM WHICH AIR IS EVACUATED AND INTO WHICH PROTECTIVE GAS IS INTRODUCED AT A PRESSURE ABOVE ATMOSPHERIC. THE NOCULAR CAST IRON IS STORED AND KEPT HOT IN THE FURNACE AND IS TAPPED OFF THROUGH THE OUTLET. THE OVERPRESSURE ABOVE THE MELT IS PREFERABLY MAINTAINED AT 0.005 TO 0.3 ATOMSPHERE. CALCIUM CARBIDE MAY BE ADDED FROM TIME TO TIME TO FORM SLAG.
Inventors
- 👤 G Andersson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:15
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/10; C21C5/00; C21C5/52; C21C5/5241; C21C7/00; C21C7/10; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |