US2900247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making sponge iron
Assignee: FIERRO ESPOUJA SA
•
Filing: 1957-08-05
•
Granted: 1959-08-18
•
Expires: 1977-08-05
Abstract
No abstract record available.
Inventors
- 👤 Celada Juan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:04
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/04; C21B13/0073; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
THE METHOD OF REDUCING IRON ORE TO PRODUCE SPONGE IRON COMPRISING THE STEPS OF HEATING A STREAM OF REDUCING GAS LARGELY COMPOSED OF HYDROGEN AND CARBON MONOXIDE TO A TEMPERATURE OF 1300* TO 1750*F., SEPARATELY HEATING A STREAM OF AIR TO A TEMPERATURE OF 1300* TO 1750*F., CONTINUOUSLY MIXING THE HEATED STREAM OF AIR AND HEATED STREAM OF REDUCING GAS IN THE PROPORTION OF FROM 0.1
Claim 2
Independent Claim
66 words
THE METHOD OF REDUCING IRON ORE TO PRODUCE SPONGE IRON COMPRISING THE STEPS OF HEATING A STREAM OF REDUCING GAS LARGELY COMPOSED OF HYDROGEN AND CARBON MONOXIDE TO A TEMPERATURE OF 1300* TO 1750*F., SEPARATELY HEATING A STREAM OF AIR TO A TEMPERATURE OF 1300* TO 1750*F., CONTINUOUSLY MIXING THE HEATED STREAM OF AIR AND HEATED STREAM OF REDUCING GAS IN THE PROPORTION OF FROM 0.1
References Cited (Backward Citations)
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US2399984A
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US2540593A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |