US2883279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and arrangement for refining metal baths in rotary furnaces
Assignee: Huettenwerk Oberhausen AG
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Filing: 1957-07-24
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Granted: 1959-04-21
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Expires: 1977-07-24
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 14:06
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
IN THE PROCESS OF REFINING A METAL BATH COVERED WITH SLAG, IN A ROTARY FURNACE DURING THE ROTATION OF THE LATTER ABOUT A SUBSTANTIALLY HORIZONTAL AXIS, BY INJECTING GASEOUS REFINING AGENT, ON THE ONE HAND, INTO THE METAL BATH BELOW THE SURFACE 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 AN IMPROVED METHOD OF OPERATION COMPRISING THE STEPS OF (1) 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, DURING AT LEAST PART OF THE REFINING PROCESS BY ADJUSTING (A) THE LEVEL OF INJECTION OF REFINING AGENT BELOW THE BATH SURFACE, AND (B) THE RATIO BETWEEN THE RATE OF INJECTION OF REFINING AGENT, DESTINED FOR BURNING CARBON MONOXIDE, INTO THE SPACE ABOVE THE BATH AND THE RATE OF INJECTION OF REFINING AGENT BELOW THE SURFACE OF THE BATH INTO THE LATTER TO AT-
Claim 2
Dependent Claim
171 words
IN THE PROCESS OF REFINING A METAL BATH COVERED WITH SLAG, IN A ROTARY FURNACE DURING THE ROTATION OF THE LATTER ABOUT A SUBSTANTIALLY HORIZONTAL AXIS, BY INJECTING GASEOUS REFINING AGENT, ON THE ONE HAND, INTO THE METAL BATH BELOW THE SURFACE 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 AN IMPROVED METHOD OF OPERATION COMPRISING THE STEPS OF (1) 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, DURING AT LEAST PART OF THE REFINING PROCESS BY ADJUSTING (A) THE LEVEL OF INJECTION OF REFINING AGENT BELOW THE BATH SURFACE, AND (B) THE RATIO BETWEEN THE RATE OF INJECTION OF REFINING AGENT, DESTINED FOR BURNING CARBON MONOXIDE, INTO THE SPACE ABOVE THE BATH AND THE RATE OF INJECTION OF REFINING AGENT BELOW THE SURFACE OF THE BATH INTO THE LATTER TO AT-
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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) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |