Patent US3390979A successfully refreshed from Google Patents.
US3390979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct steel making process
Assignee: Individual
•
Filing: 1963-01-14
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Granted: 1968-07-02
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Expires: 1983-01-14
Abstract
No abstract record available.
Inventors
- 👤 Albert E Greene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:41
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/08; C21B13/085; C21B13/006; C21B13/12; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
THE PROCESS OF REDUCING IRON OXIDE IN ORE MATERIAL CONTAINING IT, WHICH PROCESS COMPRISES PROVIDING A FURNACE CHAMBER AND MEANS FOR HEATING CHARGE THEREIN TO AT LEAST 2800*F.; PREPARING PARTICLE CHARGE OF THE ORE MATERIAL; ADMITTING THIS INTO THE FURNACE CHAMBER; SUBJECTING IT TO REDUCTION THEREIN BY REDUCING MATERIAL IN CONTACT WITH THE ORE MATERIAL PARTICLES AT TEMPERATURE ABOVE FUSION AND STICKING OF THE ORE CHARGE PATICLES WHILE MAINTAINING CONDITIONS REDUCING TO THE METAL OXIDE DESIRED REDUCED: REDUCING THE METAL OXIDE IN THE PARTICLES TO DENSE SOLID STATE METAL PARTICLES; DISCHARGING THE REDUCED METAL FROM THE CHAMBER AND SEPARATING UNREDUCED MATERIAL.
Claim 2
Dependent Claim
101 words
THE PROCESS OF REDUCING IRON OXIDE IN ORE MATERIAL CONTAINING IT, WHICH PROCESS COMPRISES PROVIDING A FURNACE CHAMBER AND MEANS FOR HEATING CHARGE THEREIN TO AT LEAST 2800*F.; PREPARING PARTICLE CHARGE OF THE ORE MATERIAL; ADMITTING THIS INTO THE FURNACE CHAMBER; SUBJECTING IT TO REDUCTION THEREIN BY REDUCING MATERIAL IN CONTACT WITH THE ORE MATERIAL PARTICLES AT TEMPERATURE ABOVE FUSION AND STICKING OF THE ORE CHARGE PATICLES WHILE MAINTAINING CONDITIONS REDUCING TO THE METAL OXIDE DESIRED REDUCED: REDUCING THE METAL OXIDE IN THE PARTICLES TO DENSE SOLID STATE METAL PARTICLES; DISCHARGING THE REDUCED METAL FROM THE CHAMBER AND SEPARATING UNREDUCED MATERIAL.
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) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |