Patent US2988442A successfully refreshed from Google Patents.
US2988442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of iron ore by hydrocarbons
Assignee: Individual
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Filing: 1959-03-17
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Granted: 1961-06-13
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Expires: 1979-03-17
Abstract
No abstract record available.
Inventors
- 👤 Tanner Gustaf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:31
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/08; C21B13/0073; C21B13/008; C21B13/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A PROCESS FOR REDUCING IRON OXIDES COMPRISING ADVANCING AND AGITATING A STREAM OF HEATED PARTICLES OF IRON OXIDE AND METALLIC IRON, DIRECTING A HEATED HYDROCARBON GAS COUNTERCURRENT TO SAID STREAM AND INTO CONTACT WITH THE PARTICLES, MAINTAINING THE TEMPERATURE OF SAID PARTICLES BETWEEN ABOUT 500*C. AND 580*C. TO DECOMPOSE SAID HYDROCARBON GAS PARTIALLY BY CONTACT WITH THE METALLIC IRON TO FORM HYDROGEN AND DEPOSIT CARBON IN SAID STREAM, SAID HYDROGEN REACTING WITH SAID IRON OXIDES TO FORM ADDITIONAL METALLIC IRON, FORMING SAID CARBON CONTAINING STREAM OF PARTICLES INTO PELLETS AND HEATING SAID CARBON-CONTAINING PELLETS TO A TEMPERATURE OF AT LEAST 900*C. TO CONVERT THE IRON OXIDE REMAINING IN SAID PELLETS SUBSTANTIALLY COMPLETELY TO METALLIC IRON.
Claim 2
Dependent Claim
115 words
A PROCESS FOR REDUCING IRON OXIDES COMPRISING ADVANCING AND AGITATING A STREAM OF HEATED PARTICLES OF IRON OXIDE AND METALLIC IRON, DIRECTING A HEATED HYDROCARBON GAS COUNTERCURRENT TO SAID STREAM AND INTO CONTACT WITH THE PARTICLES, MAINTAINING THE TEMPERATURE OF SAID PARTICLES BETWEEN ABOUT 500*C. AND 580*C. TO DECOMPOSE SAID HYDROCARBON GAS PARTIALLY BY CONTACT WITH THE METALLIC IRON TO FORM HYDROGEN AND DEPOSIT CARBON IN SAID STREAM, SAID HYDROGEN REACTING WITH SAID IRON OXIDES TO FORM ADDITIONAL METALLIC IRON, FORMING SAID CARBON CONTAINING STREAM OF PARTICLES INTO PELLETS AND HEATING SAID CARBON-CONTAINING PELLETS TO A TEMPERATURE OF AT LEAST 900*C. TO CONVERT THE IRON OXIDE REMAINING IN SAID PELLETS SUBSTANTIALLY COMPLETELY TO METALLIC IRON.
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) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |