US2826488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making steel from pig iron
Assignee: Individual
•
Filing: 1955-06-24
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Granted: 1958-03-11
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Expires: 1975-06-24
Abstract
No abstract record available.
Inventors
- 👤 James J Bowden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:40
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/30; C21C5/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A PROCESS OF MAKING LOW PHOSPHOROUR, LOW NITROGEN STEEL FROM PIG IRONS, WHICH PROCESS COMPRISES INTRODUCING INTO A BASIC LINED REFINING ZONE THE PIG IRON IN MOLTEN STATE, A PRE-MIXED, BASIC, SLAG-FORMING COMPOSITION WHICH IS AN IRON-OXIDE BEARING MATERIAL, AN ALUMINUM OXIDE BEARING MATERIAL, AND A LIME-CONTAINING MATERIAL, IN WHICH CAO REPRESENTS 50-90%, FE2O3 5-35%, AND A12O3 0.515%, EACH BY WEIGHT IN A PREDETERMINED AMOUNT OF 2-10% INCLUSIVE OF THE WEIGHT OF THE METAL CHARGE THE MAJOR COMPONENT OF WHICH IS MOLTEN PIG IRON, INJECTING AN OXIDIZING GAS HAVING A FREE OXYGEN CONTENT OF AT LEAST 95% BY VOLUME SUBSTANTIALLY AT THE METAL SURFACE, AND INTERMIXING THE SLAG AND METAL PHESES AND CONTINUING THE INJECTION OF SAID GAS SUBSTANTIALLY AT THE METAL SURFACE UNTIL THE CARBON IS REDUCED TO THE DESIRED FINAL EXTENT BY OXIDATION THEREOF.
Claim 2
Dependent Claim
136 words
A PROCESS OF MAKING LOW PHOSPHOROUR, LOW NITROGEN STEEL FROM PIG IRONS, WHICH PROCESS COMPRISES INTRODUCING INTO A BASIC LINED REFINING ZONE THE PIG IRON IN MOLTEN STATE, A PRE-MIXED, BASIC, SLAG-FORMING COMPOSITION WHICH IS AN IRON-OXIDE BEARING MATERIAL, AN ALUMINUM OXIDE BEARING MATERIAL, AND A LIME-CONTAINING MATERIAL, IN WHICH CAO REPRESENTS 50-90%, FE2O3 5-35%, AND A12O3 0.515%, EACH BY WEIGHT IN A PREDETERMINED AMOUNT OF 2-10% INCLUSIVE OF THE WEIGHT OF THE METAL CHARGE THE MAJOR COMPONENT OF WHICH IS MOLTEN PIG IRON, INJECTING AN OXIDIZING GAS HAVING A FREE OXYGEN CONTENT OF AT LEAST 95% BY VOLUME SUBSTANTIALLY AT THE METAL SURFACE, AND INTERMIXING THE SLAG AND METAL PHESES AND CONTINUING THE INJECTION OF SAID GAS SUBSTANTIALLY AT THE METAL SURFACE UNTIL THE CARBON IS REDUCED TO THE DESIRED FINAL EXTENT BY OXIDATION THEREOF.
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) | 1961-03-10 | 1961-09-09 | 1962-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-10 | 1965-09-09 | 1966-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-10 | 1969-09-09 | 1970-03-11 | $7700.00 | Window Closed / Lapsed |