Patent US478247A successfully refreshed from Google Patents.
Patent US3570831A successfully refreshed from Google Patents.
US3570831A
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Process and arrangement for evacuation of gas developed during a continuous metal refining operation
Assignee: Institut de Recherches de la Siderurgie Francaise IRSID
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Filing: 1968-09-06
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Granted: 1971-03-16
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Expires: 1988-09-06
Abstract
Abstract A PROCESS FOR DISCHARGING GAS DEVELOPED DURING A CONTINUOUS METAL REFINING OPERATION IN A REFINING APPARATUS INCLUDING A FIRST OR REACTION VESSEL AND A LAST VESSEL COMMUNICATING WITH THE FIRST VESSEL AND PROVIDED WITH A SLAG DISCHARGE OPENING COMMUNICATING WITH THE OUTER ATMOSPHERE, IN WHICH THE GAS IS EXHAUSTED THROUGH A PAIR OF CONDUITS RESPECTIVELY COMMUNICATING WITH SAID FIRST AND SAID LAST VESSEL AND IN WHICH THE AMOUNT OF GAS PASSING THROUGH THE PAIR OF CONDUITS IS REGULATED IN SUCH A MANNER THAT ESCAPE OF GAS THROUGH THE SLAG DISCHARGE OPENING IS POSITIVELY PREVENTED, AND AN ARRANGEMENT FOR CARRYING OUT THE PROCESS.
Inventors
- 👤 Jean Rouanet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:09
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/56; C21C5/567; C21C5/28; C21C5/38; C21C5/40; 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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |