US3356490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining pig iron
Assignee: Centre de Recherches Metallurgiques CRM ASBL
•
Filing: 1965-04-23
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Granted: 1967-12-05
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Expires: 1985-04-23
Abstract
No abstract record available.
Inventors
- 👤 Muller Francois
- 👤 Nilles Paul
- 👤 Denis Etienne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:03
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/36; C21C1/00; C21C5/30; C21C5/32; C21C5/56; C21C5/567; D; D06; D06F; D06F37/00; D06F37/30; D06F37/36; C21C2005/366; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
IN A PROCESS OF REFINING PIG IRON WHICH COMPRISES TOP BLOWING PIG IRON IN A REFINING VESSEL WITH AN OXIDIZING GAS, THE IMPROVEMENT COMPRISING PRODUCING A FOAMING SLAG ON THE MOLTEN METAL, AND REMOVING AT LEAST PART OF SAID FOAMING SLAG BY CONTINUOUSLY OVERFLOWING FROM THE REFINING VESSEL DURING AT LEAST PART OF THE OPERATION.
Claim 2
Dependent Claim
55 words
IN A PROCESS OF REFINING PIG IRON WHICH COMPRISES TOP BLOWING PIG IRON IN A REFINING VESSEL WITH AN OXIDIZING GAS, THE IMPROVEMENT COMPRISING PRODUCING A FOAMING SLAG ON THE MOLTEN METAL, AND REMOVING AT LEAST PART OF SAID FOAMING SLAG BY CONTINUOUSLY OVERFLOWING FROM THE REFINING VESSEL DURING AT LEAST PART OF THE OPERATION.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |