Patent US2977217A successfully refreshed from Google Patents.
US2977217A
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Method for refining metal baths in rotary drum furnaces
Assignee: Huettenwerk Oberhausen AG
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Filing: 1958-05-16
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Granted: 1961-03-28
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Expires: 1978-05-16
Abstract
No abstract record available.
Inventors
- 👤 Rudolf F Graef
- 👤 Bogdandy Ludwig A Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
IN A PROCESS OF REFINING A CARBON-CONTAINING METAL BATH COVERED WITH SLAG, IN A ROTARY FURNACE DURING THE ROTATION OF THE LATTER ABOUT A SUBSTANTIALLY HORIZONTAL AXIS, BY INJECTING GASEOUS OXYGEN-CONTAINING REFINING AGENT, ON THE ONE HAND, INTO THE METAL BATH AT A LEVEL BELOW THE SURFACES OF THE LATTER, AND, ON THE OTHER HAND, INTO THE SPACE ABOVE THE BATH SURFACE IN ORDER TO BURN AT LEAST PARTIALLY THE CARBON MONOXIDE DEVELOPED FROM THE BATH, AND BY SELECTING A DESIRED CARBON MONOXIDE CONTENT WHICH IS TO BE MAINTAINED DURING AT LEAST PART OF THE REFINING PROCESS IN THE WASTE GASES LEAVING THE FURNACE BY ADJUSTING SAID LEVEL OF INJECTION OF REFINING AGENT BELOW THE BATH SURFACE, AND MAINTAINING SAID CONTENT OF CARBON MONOXIDE IN THE WASTE GASES BY CONTINUOUSLY CONTROLLING AND ADJUSTING SAID LEVEL OF INJECTION,
Claim 2
Dependent Claim
137 words
IN A PROCESS OF REFINING A CARBON-CONTAINING METAL BATH COVERED WITH SLAG, IN A ROTARY FURNACE DURING THE ROTATION OF THE LATTER ABOUT A SUBSTANTIALLY HORIZONTAL AXIS, BY INJECTING GASEOUS OXYGEN-CONTAINING REFINING AGENT, ON THE ONE HAND, INTO THE METAL BATH AT A LEVEL BELOW THE SURFACES OF THE LATTER, AND, ON THE OTHER HAND, INTO THE SPACE ABOVE THE BATH SURFACE IN ORDER TO BURN AT LEAST PARTIALLY THE CARBON MONOXIDE DEVELOPED FROM THE BATH, AND BY SELECTING A DESIRED CARBON MONOXIDE CONTENT WHICH IS TO BE MAINTAINED DURING AT LEAST PART OF THE REFINING PROCESS IN THE WASTE GASES LEAVING THE FURNACE BY ADJUSTING SAID LEVEL OF INJECTION OF REFINING AGENT BELOW THE BATH SURFACE, AND MAINTAINING SAID CONTENT OF CARBON MONOXIDE IN THE WASTE GASES BY CONTINUOUSLY CONTROLLING AND ADJUSTING SAID LEVEL OF INJECTION,
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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |