Patent US3291599A successfully refreshed from Google Patents.
US3291599A
Expired / Lapsed
US
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Chemical process
Assignee: EIDP Inc
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Filing: 1964-04-29
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Granted: 1966-12-13
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Expires: 1984-04-29
Abstract
No abstract record available.
Inventors
- 👤 James W Reeves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:24
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1204; C22B3/00; C22B3/04; C22B3/12; C22B3/14; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
THE PROCESS FOR REMOVING IRON FROM FERROTITANIFEROUS ORES TO FORM A TITANIUM DIOXIDE CONCENTRATE IN THE LEACHED ORE WHICH COMPRISES REDUCING THE IRON CONTAINED IN SAID FERROTITANIFEROUS ORES TO THE METALLIC STATE, OXIDIZING SAID IRON IN THE PRESENCE OF A LEACH LIQUOR OF AN AQUEOUS AMMONIA-AMMONIUM CARBONATE SOLUTION TO FORM A SOLUBLE FERROUS COMPLEX, FURTHER OXIDIZING SAID FERROUS COMPLEX TO FORM HYDRATED FERRIC OXIDE AS A DISTINCT SOLLID PHASE, SEPARATING SAID LEACHED ORE FROM SAID HYDRATED FERRIC OXIDE AND SAID LEACH LIQUOR AND THEREAFTER RECOVERING SAID TITANIUM DIOXIDE CONCENTRATE.
Claim 2
Dependent Claim
89 words
THE PROCESS FOR REMOVING IRON FROM FERROTITANIFEROUS ORES TO FORM A TITANIUM DIOXIDE CONCENTRATE IN THE LEACHED ORE WHICH COMPRISES REDUCING THE IRON CONTAINED IN SAID FERROTITANIFEROUS ORES TO THE METALLIC STATE, OXIDIZING SAID IRON IN THE PRESENCE OF A LEACH LIQUOR OF AN AQUEOUS AMMONIA-AMMONIUM CARBONATE SOLUTION TO FORM A SOLUBLE FERROUS COMPLEX, FURTHER OXIDIZING SAID FERROUS COMPLEX TO FORM HYDRATED FERRIC OXIDE AS A DISTINCT SOLLID PHASE, SEPARATING SAID LEACHED ORE FROM SAID HYDRATED FERRIC OXIDE AND SAID LEACH LIQUOR AND THEREAFTER RECOVERING SAID TITANIUM DIOXIDE CONCENTRATE.
References Cited (Backward Citations)
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Cited
US2717829A
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US2953424A
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US2864690A
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US3069235A
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US3099526A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |