Patent US2999748A successfully refreshed from Google Patents.
US2999748A
Expired / Lapsed
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Process of reducing molded bodies comprising metallic oxides
Assignee: Elektrokemisk AS
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Filing: 1959-11-24
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Granted: 1961-09-12
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Expires: 1979-11-24
Abstract
No abstract record available.
Inventors
- 👤 Basen Toralv
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:57
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/14; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/942; C21B13/02; C21B13/12; C21B2100/00; C21B2100/60; C21B2100/66; Y; Y02; Y02P; Y02P10/00; Y02P10/25; Y02P20/00; Y02P20/10; Y02P20/129
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
IN THE PROCESS OF TREATING IRON OXIDES FOR USE IN AN ELECTRIC SMELTING FURNACE THE STEPS OF FORMING MOLDED AGGREGATES OF THE OXIDE AND A CORBONACEOUS REDUCING AGENT, PASSING SUCH AGGREATES DOWNWARDLY IN THE SHAFT, HEATING SUCH AGGREGATES IN A CENTRAL PORTION OF THE SHAFT TO A TEMPERATURE BETWEEN 800*C. AND 1300* C. AT WHICH THE REDUCING AGENT IS CAUSED TO REACT WITH THE OXIDE TO GENERATE CO AND SUPPLYING AIR TO THE CENTRAL PORTION OF THE SHAFT WHEREBY SUCH GENERATED CO FROM THE CHARGE IS BURNED IN THE CENTRAL PORTION OF THE SHAFT CONTINUOUSLY TO HEAT THE CHARGE AS IT MOVES DOWN WHEREBY SOME SINTERING MAY TAKE PLACE IN THE PORTION OF THE CHARGE TOWARD THE CENTER WHILE THE AGGREGATES IN THE OUTER AREA OF THE SHAFT THAT CONTACT THE LINING REMAIN SEPARATE AND FREE FLOWING SO THAT LODGING OF THE CHARGE IS PREVENTED, AND CAUSING THE PRODUCTS OF COMBUSTION TO MOVE DOWNWARDLY IN THE SHAFT FROM THE COMBUSTION ZONE SO VOLATILES ARE NOT DRIVEN OUT OF THE CHARGE BEFORE IT REACHES THE COMBUSTION ZONE.
Claim 2
Dependent Claim
176 words
IN THE PROCESS OF TREATING IRON OXIDES FOR USE IN AN ELECTRIC SMELTING FURNACE THE STEPS OF FORMING MOLDED AGGREGATES OF THE OXIDE AND A CORBONACEOUS REDUCING AGENT, PASSING SUCH AGGREATES DOWNWARDLY IN THE SHAFT, HEATING SUCH AGGREGATES IN A CENTRAL PORTION OF THE SHAFT TO A TEMPERATURE BETWEEN 800*C. AND 1300* C. AT WHICH THE REDUCING AGENT IS CAUSED TO REACT WITH THE OXIDE TO GENERATE CO AND SUPPLYING AIR TO THE CENTRAL PORTION OF THE SHAFT WHEREBY SUCH GENERATED CO FROM THE CHARGE IS BURNED IN THE CENTRAL PORTION OF THE SHAFT CONTINUOUSLY TO HEAT THE CHARGE AS IT MOVES DOWN WHEREBY SOME SINTERING MAY TAKE PLACE IN THE PORTION OF THE CHARGE TOWARD THE CENTER WHILE THE AGGREGATES IN THE OUTER AREA OF THE SHAFT THAT CONTACT THE LINING REMAIN SEPARATE AND FREE FLOWING SO THAT LODGING OF THE CHARGE IS PREVENTED, AND CAUSING THE PRODUCTS OF COMBUSTION TO MOVE DOWNWARDLY IN THE SHAFT FROM THE COMBUSTION ZONE SO VOLATILES ARE NOT DRIVEN OUT OF THE CHARGE BEFORE IT REACHES THE COMBUSTION ZONE.
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) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |