Patent US2925321A successfully refreshed from Google Patents.
US2925321A
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Extraction of uranium from lignite ores
Assignee: International Resources Corp
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Filing: 1956-09-10
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Granted: 1960-02-16
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Expires: 1976-09-10
Abstract
No abstract record available.
Inventors
- 👤 Burt C Mariacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:14
CPC Classifications
C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0208
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
THE PROCESS OF TREATING LIGNITE ORES HAVING A URANIUM CONTENT, WHICH COMPRISES ROASTING SUCH A LIGNITE ORE IN CRUSHED CONDITION UNTIL THE VOLATILE CONTENT IS DRIVEN OFF AND MOST OF THE CARBON CONTENT IS OXIDIZED, ADDING TO THE ASH RESIDUE OF SAID ROAST A QUANTITY OF A SULFATING COMPOSITION SELECTED FROM THE CLASS CONSISTING OF SULFIDES OF IRON, ZINC AND COPPER, SUBJECTING SUCH MIXTURE TO A SECOND ROASTILNG ACTION SO AS TO CONVERT THE CONTAINED URANIUM TO A WATER SOLUBLE CONDITION, AND LEACHING THE ASH RESIDUE OF SAID ROAST IN WATER FOR RECOVERY OF URANIUM.
Claim 2
Dependent Claim
95 words
THE PROCESS OF TREATING LIGNITE ORES HAVING A URANIUM CONTENT, WHICH COMPRISES ROASTING SUCH A LIGNITE ORE IN CRUSHED CONDITION UNTIL THE VOLATILE CONTENT IS DRIVEN OFF AND MOST OF THE CARBON CONTENT IS OXIDIZED, ADDING TO THE ASH RESIDUE OF SAID ROAST A QUANTITY OF A SULFATING COMPOSITION SELECTED FROM THE CLASS CONSISTING OF SULFIDES OF IRON, ZINC AND COPPER, SUBJECTING SUCH MIXTURE TO A SECOND ROASTILNG ACTION SO AS TO CONVERT THE CONTAINED URANIUM TO A WATER SOLUBLE CONDITION, AND LEACHING THE ASH RESIDUE OF SAID ROAST IN WATER FOR RECOVERY OF URANIUM.
References Cited (Backward Citations)
CA493787A
Cited
US1429550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-15 | 1963-08-17 | 1964-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-15 | 1967-08-17 | 1968-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-15 | 1971-08-17 | 1972-02-16 | $7700.00 | Window Closed / Lapsed |