US2990269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining of ores with hydrocarbon gases
Assignee: Arthur D Little Inc
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Filing: 1959-03-17
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Granted: 1961-06-27
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Expires: 1979-03-17
Abstract
No abstract record available.
Inventors
- 👤 Richard W Hyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:20
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0033; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
128 words
A PROCESS OF REDUCING IRON OXIDES TO METALLIC IRON COMPRISING BURNING A HYDROCARBON GAS HEATED TO A TEMPERATURE BETWEEN ABOUT 535*C. AND 660*C. WITH AIR HEATED TO BETWEEN ABOUT 875*C. AND 1000*C. IN AN AMOUNT INSUFFICIENT TO PRODUCE COMBUSTION PRODUCTS HAVING A TEMPERATURE SUBSTANTIALLY IN EXCESS OF 1150*C., PASSING THE HOT COMBUSTION PRODUCTS INTO A BED OF IRON OXIDE CONTAINING METALLIC IRON FROM BELOW TO FLUIDIZE SAID BED, SAID BED HAVING AN ATOMIC OXYGEN TO IRON RATIO SUCH THAT SAID BED IS ABOUT 75% TO 80% METALLIZED, SAID METALLIC IRON SERVING AS A CATALYST TO CONVERT THE COMBUSTION PRODUCTS TO A REDUCING GAS COMPOSED PRINCIPALLY OF HYDROGEN AND CARBON MONOXIDE AND SAID REDUCING GAS REACTING WITH SAID IRON OXIDE TO CONVERT IT AT LEAST PARTIALLY TO METALLIC IRON.
References Cited (Backward Citations)
US2711368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |