Patent US3128174A successfully refreshed from Google Patents.
US3128174A
Expired / Lapsed
US
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Method of making sponge iron
Assignee: Fierro Esponja SA
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Filing: 1959-06-26
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Granted: 1964-04-07
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Expires: 1979-06-26
Abstract
No abstract record available.
Inventors
- 👤 Celada Juan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:53
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
134 words
IN A METHOD OF PREPARING A HOT REDUCING GAS MIXTURE ADAPTED TO BE USED FOR THE REDUCTION OF IRON ORE TO SPONGE IRON OF THE TYPE WHEREIN A STREAM OF PREHEATED AIR IS ADDED TO A HEATED REDUCING GAS COMPOSED ESSENTIALLY OF CARBON MONOXIDE AND HYDROGEN, THE AMOUNT OF ADDED AIR BEING SUCH AS TO BURN ONLY PARTIALLY THE REDUCING CONSTITUENTS OF THE REDUCING GAS TO PRODUCE A REDUCING GAS MIXTURE AT A TEMPERATURE OF 1800* TO 2250*F., THE IMPROVEMENT WHICH COMPRISES ADDING A GASEOUS HYDROCARBON TO AND BURNING THE SAID HYDROCARBON IN THE AIR STREAM PRIOR TO ADMIXTURE OF THE AIR STREAM WITH THE REDUCING GAS AND IN AN AMOUNT INSUFFICIENT TO REACT WITH ALL OF THE OXYGEN OF THE AIR STREAM WHEREBY AN OXIDIZING MIXTURE IS PRODUCED, AND MIXING SAID OXIDIZING MIXTURE
Claim 2
Dependent Claim
134 words
IN A METHOD OF PREPARING A HOT REDUCING GAS MIXTURE ADAPTED TO BE USED FOR THE REDUCTION OF IRON ORE TO SPONGE IRON OF THE TYPE WHEREIN A STREAM OF PREHEATED AIR IS ADDED TO A HEATED REDUCING GAS COMPOSED ESSENTIALLY OF CARBON MONOXIDE AND HYDROGEN, THE AMOUNT OF ADDED AIR BEING SUCH AS TO BURN ONLY PARTIALLY THE REDUCING CONSTITUENTS OF THE REDUCING GAS TO PRODUCE A REDUCING GAS MIXTURE AT A TEMPERATURE OF 1800* TO 2250*F., THE IMPROVEMENT WHICH COMPRISES ADDING A GASEOUS HYDROCARBON TO AND BURNING THE SAID HYDROCARBON IN THE AIR STREAM PRIOR TO ADMIXTURE OF THE AIR STREAM WITH THE REDUCING GAS AND IN AN AMOUNT INSUFFICIENT TO REACT WITH ALL OF THE OXYGEN OF THE AIR STREAM WHEREBY AN OXIDIZING MIXTURE IS PRODUCED, AND MIXING SAID OXIDIZING MIXTURE
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) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |