Patent US3356490A successfully refreshed from Google Patents.
US3356490A
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Refining pig iron
Assignee: Centre de Recherches Metallurgiques CRM ASBL
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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 10:04
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.
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Cited
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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) | 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 |