US2665982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desulfurization and decarburization of iron and iron alloys
Assignee: Airco Inc
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Filing: 1949-05-05
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Granted: 1954-01-12
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Expires: 1969-05-05
Abstract
No abstract record available.
Inventors
- 👤 Francis T Crego
- 👤 Harold R Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:24
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
THE METHOD OF REMOVING SULPHUR AND CARBON FROM IRON OR STEEL WHICH COMPRISES MAINTAINING A MOLTEN BATH OF THE IRON OR STEEL ON AN OPEN HEARTH FURNACE, MAINTAINING A HIGHLY BASIC AND FLUID SLAG HAVING A LIME TO SILICA RATIO OF AT LEAST 2.5 TO 1 ON THE MOLTEN BATH, INTRODUCING A NON-OXIDIZING GASEOUS MEDIUM BENEATH THE SURFACE OF THE MOLTEN BATH TO EFFECT AGITATION THEREOF, CONTINUING SUCH INTRODUCTION OF THE NON-OXIDIZING GAS UNTIL A PREDETERMIND DEGREE OF DESULPHURIZATION OF THE MOLTEN BATH HAS BEEN OBTAINED, MAINTAINING THE MOLTEN METAL FREE OF OXIDIZING AGENTS DURING THE INTRODUCTION OF THE NON-OXIDIZING GASEOUS MEDIUM, REMOVING THE HIGHLY BASIC SLAG FROM THE MOLTEN METAL, AND THEN DECARBURIZING THE MOLTEN BATH ON THE SAME HEARTH IN WHICH DESULPHURIZATION WAS OBTAINED BY INTRODUCING OXYGEN INTO THE MOLTEN METAL BATH TO COMBINE WITH CARBON OF THE MOLTEN METAL AND TO RAISE THE TEMPERATURE OF THE BATH.
Claim 2
Independent Claim
150 words
THE METHOD OF REMOVING SULPHUR AND CARBON FROM IRON OR STEEL WHICH COMPRISES MAINTAINING A MOLTEN BATH OF THE IRON OR STEEL ON AN OPEN HEARTH FURNACE, MAINTAINING A HIGHLY BASIC AND FLUID SLAG HAVING A LIME TO SILICA RATIO OF AT LEAST 2.5 TO 1 ON THE MOLTEN BATH, INTRODUCING A NON-OXIDIZING GASEOUS MEDIUM BENEATH THE SURFACE OF THE MOLTEN BATH TO EFFECT AGITATION THEREOF, CONTINUING SUCH INTRODUCTION OF THE NON-OXIDIZING GAS UNTIL A PREDETERMIND DEGREE OF DESULPHURIZATION OF THE MOLTEN BATH HAS BEEN OBTAINED, MAINTAINING THE MOLTEN METAL FREE OF OXIDIZING AGENTS DURING THE INTRODUCTION OF THE NON-OXIDIZING GASEOUS MEDIUM, REMOVING THE HIGHLY BASIC SLAG FROM THE MOLTEN METAL, AND THEN DECARBURIZING THE MOLTEN BATH ON THE SAME HEARTH IN WHICH DESULPHURIZATION WAS OBTAINED BY INTRODUCING OXYGEN INTO THE MOLTEN METAL BATH TO COMBINE WITH CARBON OF THE MOLTEN METAL AND TO RAISE THE TEMPERATURE OF THE BATH.
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) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |