US2853377A
Expired / Lapsed
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Two step refining process in a tiltable rotary furnace
Assignee: Stora Enso Oyj
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Filing: 1955-11-18
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Granted: 1958-09-23
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Expires: 1975-11-18
Abstract
No abstract record available.
Inventors
- 👤 Kalling Bo Michael Sture
- 👤 Johansson Folke Carl Evald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:41
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/30; C21C5/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN REFINING MOLTEN FERROUS METAL CONTAINING CARBON IN A TIPPABLE FURNACE ROTATABLE ABOUT AN AXIS OF ROTATION BY BLOWING THE MOLTEN METAL WITH A GAS CONTAINING AT LEAST 40% FREE OXYGEN THE IMPROVED METHOD WHICH COMPRISES PERFORMING SAID BLOWING DURING A STAGE OF THE PROCESS DURING WHICH THE FURNACE ROTATES WITH ITS AXIS OF ROTATION INCLINED NOT MORE THAN 45* FROM THE HORIZONTAL THE OXYGEN CONTAINING GAS BEING INTRODUCED THROUGH A CENTRAL OPENING IN AN END WALL OF THE FURNACE AND DURING ANOTHER STAGE OF THE PROCESS DURING WHICH THE AXIS OF ROTATION OF THE FURNACE IS APPROXIMATELY VERTICAL, THE OXYGEN CONTAINING GAS BEING SUPPLIED TO THE MOLTEN METAL FROM ABOVE.
Claim 2
Dependent Claim
111 words
IN REFINING MOLTEN FERROUS METAL CONTAINING CARBON IN A TIPPABLE FURNACE ROTATABLE ABOUT AN AXIS OF ROTATION BY BLOWING THE MOLTEN METAL WITH A GAS CONTAINING AT LEAST 40% FREE OXYGEN THE IMPROVED METHOD WHICH COMPRISES PERFORMING SAID BLOWING DURING A STAGE OF THE PROCESS DURING WHICH THE FURNACE ROTATES WITH ITS AXIS OF ROTATION INCLINED NOT MORE THAN 45* FROM THE HORIZONTAL THE OXYGEN CONTAINING GAS BEING INTRODUCED THROUGH A CENTRAL OPENING IN AN END WALL OF THE FURNACE AND DURING ANOTHER STAGE OF THE PROCESS DURING WHICH THE AXIS OF ROTATION OF THE FURNACE IS APPROXIMATELY VERTICAL, THE OXYGEN CONTAINING GAS BEING SUPPLIED TO THE MOLTEN METAL FROM ABOVE.
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) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |