US2643185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cupola melting of cast iron
Assignee: American Cast Iron Pipe Co
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Filing: 1950-04-27
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Granted: 1953-06-23
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Expires: 1970-04-27
Abstract
No abstract record available.
Inventors
- 👤 Jr Sam F Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:32
CPC Classifications
C; C21; C21C; C21C1/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
84 words
A PROCESS OF PRODUCING LOW SULFUR, HIGH CARBON CAST IRON DIRECTLY FROM A CUPOLA, WITHOUT SUBSEQUENT TREATMENT, WHICH COMPRISES THE STEPS OF INTRODUCING INTO A CUPOLA AT A POINT SUBSTANTIALLY ABOVE THE MEETING ZONE THEREOF CHARGES CONTAINING IRON METAL, COKE AND CALCIUM CARBIDE IN SOLID FORM, MELTING THE METAL PORTION OF THE CHARGES BY COMBUSTION OF THE COKE IN THE PRESENCE OF THE CALCIUM CARBIDE, AND UTILIZING THE PRODUCTS OF COMBUSTION TO HEAT THE CARBIDE DURING DESCENT OF THE CHARGES TO THE MELTING ZONE.
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) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |