Patent US3389988A successfully refreshed from Google Patents.
US3389988A
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US
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Process of direct reduction of iron oxides in fluidized beds
Assignee: Office National Industriel de lAzote
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Filing: 1965-04-01
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Granted: 1968-06-25
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Expires: 1985-04-01
Abstract
No abstract record available.
Inventors
- 👤 Theophile F L Cambon
- 👤 Georges A M Igounenc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:27
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0033; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/122; Y02P10/134; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2864686A
Cited
US2915379A
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US2947620A
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US3148972A
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US3118757A
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US3131052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |