US2961298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of iron from iron-bearing titaniferous raw materials
Assignee: NILS KRISTIAN GUSTAV THOLAND
•
Filing: 1956-09-05
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Granted: 1960-11-22
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Expires: 1976-09-05
Abstract
No abstract record available.
Inventors
- 👤 Tikkanen Matti Haakon August
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:02
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1204; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
47 words
A PROCESS FOR SELECTIVELY LEACHING IRON FROM AN IRON-BEARING TITANIFEROUS RAW MATERIAL, WHICH CONSISTS IN ROASTING SAID MATERIAL IN AN OXIDIZING ENVIRONMENT AT A TEMPERATURE OF 800* TO 1350*C., AND THEREAFTER TREATING THE ROASTED MATERAL WITH HOT AQUEOUS SULFURIC ACID UNDER REDUCING CONDITIONS TO LEACH IRON THEREFROM.
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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) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |