US2760856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing low sulphur blast furnace iron
Assignee: United States Steel Corp
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Filing: 1953-02-09
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Granted: 1956-08-28
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Expires: 1973-02-09
Abstract
No abstract record available.
Inventors
- 👤 Dennis J Carney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:17
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE METHOD OF PRODUCING BLAST FURNACE IRON HAVING A LOW SULPHUR CONTENT WHICH COMPRISES THE STEP OF OPERATING A BLAST FURNACE TO MAINTAIN A BATH OF MOLTEN SLAG IN THE HEARTH ZONE THEREOF THROUGH WHICH MOLTEN IRON PRODUCED IN THE HIGHER ZONES OF THE FURNACE PASSES AND ACCUMULATES ON THE BOTTOM OF THE HEARTH ZONE; REMOVING SAID IRON FROM SAID HEARTH ZONE AT PERIODIC INTERVALS; AND MAINTAINING THE SLAG IN A HIGHLY DEOXIDIZED CONDITION BY INTRODUCING INTO THE SLAG IN SAID HEARTH ZONE, AT INTERVALS NOT MORE THAN ABOUT ONE-HALF HOUR AFTER EACH OF SAID PERIODIC REMOVALS OF MOLTEN IRON SAID HEARTH ZONE, A DEOXIDIZER CAPABLE OF DEOXIDIZING SAID SLAG TO RENDER THE SLAG MORE EFFICIENT AS A DESULPHURIZER OF THE MOLTEN IRON SUBSEQUENTLY PASSING THROUGH THE SLAG.
Claim 2
Independent Claim
128 words
THE METHOD OF PRODUCING BLAST FURNACE IRON HAVING A LOW SULPHUR CONTENT WHICH COMPRISES THE STEP OF OPERATING A BLAST FURNACE TO MAINTAIN A BATH OF MOLTEN SLAG IN THE HEARTH ZONE THEREOF THROUGH WHICH MOLTEN IRON PRODUCED IN THE HIGHER ZONES OF THE FURNACE PASSES AND ACCUMULATES ON THE BOTTOM OF THE HEARTH ZONE; REMOVING SAID IRON FROM SAID HEARTH ZONE AT PERIODIC INTERVALS; AND MAINTAINING THE SLAG IN A HIGHLY DEOXIDIZED CONDITION BY INTRODUCING INTO THE SLAG IN SAID HEARTH ZONE, AT INTERVALS NOT MORE THAN ABOUT ONE-HALF HOUR AFTER EACH OF SAID PERIODIC REMOVALS OF MOLTEN IRON SAID HEARTH ZONE, A DEOXIDIZER CAPABLE OF DEOXIDIZING SAID SLAG TO RENDER THE SLAG MORE EFFICIENT AS A DESULPHURIZER OF THE MOLTEN IRON SUBSEQUENTLY PASSING THROUGH THE SLAG.
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) | 1959-08-28 | 1960-02-27 | 1960-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-28 | 1964-02-27 | 1964-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-28 | 1968-02-27 | 1968-08-28 | $7700.00 | Window Closed / Lapsed |