US2993781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making steel
Assignee: United States Steel Corp
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Filing: 1959-05-27
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Granted: 1961-07-25
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Expires: 1979-05-27
Abstract
No abstract record available.
Inventors
- 👤 Walter L Kerlie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:07
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
139 words
THE METHOD OF MAKING STEEL IN A REGENERATIVE TYPE FURNACE WHICH COMPRISES CHARGING THE FURNACE WITH A PRIMARY CHARGE CONSISTING ESSENTIALLY OF SCRAP, HEATING THE SCRAP TO A TEMPERATURE BELOW ITS LIQUIDUS TEMPERATURE, ADDING A SECOND CHARGE OF MOLTEN PIG IRON AND LIME, THE TEMPERATURE TO WHICH THE SCRAP IS HEATED PRIOR TO ADDING THE SECOND CHARGE BEING SUCH THAT WHEN MIXED WITH THE MOLTEN PIG IRON THE RESULTANT MIXTURE WILL HAVE AN AVERAGE TEMPERATURE AT LEAST EQUAL TO THE LIQUIDUS TEMPERATURE OF THE MIXTURE, FEEDING OXYGEN-BEARING GAS INTO THE BATH AT A CONTROLLED RATE AFTER THE SECOND CHARGE HAS BEEN ADDED, SHUTTING OFF FUEL TO THE FURNACE AND GREATLY DECREASING THE FLOW OF AIR FROM THE REGENERATORS DURING THE INTRODUCTION OF OXYGEN-BEARING GAS INTO THE BATH, AND TAPPING THE FURNACE AFTER THE STEEL HAS REACHED THE DESIRED COMPOSITION.
References Cited (Backward Citations)
US2878115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |