US2990272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desulphurizing molten iron
Assignee: Allegheny Ludlum Steel Corp
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Filing: 1960-03-29
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Granted: 1961-06-27
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Expires: 1980-03-29
Abstract
No abstract record available.
Inventors
- 👤 Richard B Shaw
- 👤 William G Connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:03
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C7/064; C21C1/00; C21C1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
203 words
IN THE PROCESS OF DESULFURIZING FERROUS ALLOYS, THE STEPS COMPRISING, MAKING A MELT OF A FERROUS ALLOY IN A FURNACE UNDER SLAG, ADJUSTING THE COMPOSITION OF THE MELT, CONDITIONING THE MELT FOR DESULFURIZATION BY TAPPING THE MELT INTO A LADLE TO EFFECT A TURBULENT REACTION THEREIN, SAID LADLE CONTAINING SOLID, BASIC, SLAG-FORMING INGREDIENTS WHICH WHEN MELTED FROM A LIQUID SLAG HAVING A COMPOSITION COMPRISING BETWEEN ABOUT 40% AND 65% CAO, BETWEEN ABOUT 15% AND 25% SIO2, BETWEEN ABOUT 5% AND 10% AL2O3, BETWEEN ABOUT 2% AND 6% MGO AND FROM ABOUT 5% TO ABOUT 30% FEO, ADJUSTING THE TEMPERATURE OF THE MELT IN SAID LADLE TO A TEMPERATURE IN THE RANGE BETWEEN ABOUT 2800*F. AND 2950*F., DECANTING THE LIQUID SLAG, POURING THE MELT INTO ANOTHER LADLE CONTAINING OTHER SOLID BASIC SLAG-FORMING INGREDIENTS TO EFFECT A TURBULENT REACTION WITHIN THE LADLE, SAID OTHER BASIC SLAGFORMING INGREDIENTS FORMING A SLAG DURING SAID TURBULENT REACTION HAVING A COMPOSITION CONTAINING FROM ABOUT 55% TO 75% CAO, BETWEEN ABOUT 2% AND 8% MGO, BETWEEN ABOUT 4% AND 10% SIO2, BETWEEN ABOUT 10% AND 25% AL8O3, AND NOT MORE THAN 1.5% FEO, AND TEEMING THE MELT INTO INGOTS, SAID TURBULENT REACTIONS AND SLAG COOPERATING TO DESULFURIZE THE FERROUS ALLOYS.
Claim 2
Dependent Claim
203 words
IN THE PROCESS OF DESULFURIZING FERROUS ALLOYS, THE STEPS COMPRISING, MAKING A MELT OF A FERROUS ALLOY IN A FURNACE UNDER SLAG, ADJUSTING THE COMPOSITION OF THE MELT, CONDITIONING THE MELT FOR DESULFURIZATION BY TAPPING THE MELT INTO A LADLE TO EFFECT A TURBULENT REACTION THEREIN, SAID LADLE CONTAINING SOLID, BASIC, SLAG-FORMING INGREDIENTS WHICH WHEN MELTED FROM A LIQUID SLAG HAVING A COMPOSITION COMPRISING BETWEEN ABOUT 40% AND 65% CAO, BETWEEN ABOUT 15% AND 25% SIO2, BETWEEN ABOUT 5% AND 10% AL2O3, BETWEEN ABOUT 2% AND 6% MGO AND FROM ABOUT 5% TO ABOUT 30% FEO, ADJUSTING THE TEMPERATURE OF THE MELT IN SAID LADLE TO A TEMPERATURE IN THE RANGE BETWEEN ABOUT 2800*F. AND 2950*F., DECANTING THE LIQUID SLAG, POURING THE MELT INTO ANOTHER LADLE CONTAINING OTHER SOLID BASIC SLAG-FORMING INGREDIENTS TO EFFECT A TURBULENT REACTION WITHIN THE LADLE, SAID OTHER BASIC SLAGFORMING INGREDIENTS FORMING A SLAG DURING SAID TURBULENT REACTION HAVING A COMPOSITION CONTAINING FROM ABOUT 55% TO 75% CAO, BETWEEN ABOUT 2% AND 8% MGO, BETWEEN ABOUT 4% AND 10% SIO2, BETWEEN ABOUT 10% AND 25% AL8O3, AND NOT MORE THAN 1.5% FEO, AND TEEMING THE MELT INTO INGOTS, SAID TURBULENT REACTIONS AND SLAG COOPERATING TO DESULFURIZE THE FERROUS ALLOYS.
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) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |