Patent US2640754A successfully refreshed from Google Patents.
US2640754A
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Treatment of carnotite ore materials
Assignee: Union Carbide Corp
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Filing: 1951-04-04
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Granted: 1953-06-02
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Expires: 1971-04-04
Abstract
No abstract record available.
Inventors
- 👤 Adolph Q Lundquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:50
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A METHOD FOR TREATING ORE MATERIALS CONTAINING OXIDIC COMPOUNDS OF URANIUM, VANADIUM AND CALCIUM WHICH COMPRISES TREATING SUCH MATERIALS WITH DILUTE SULFURIC ACID TO CONVERT SUCH CALCIUM COMPOUNDS TO CALCIUM SULFATE AND TO DIS-
Claim 2
Independent Claim
34 words
A METHOD FOR TREATING ORE MATERIALS CONTAINING OXIDIC COMPOUNDS OF URANIUM, VANADIUM AND CALCIUM WHICH COMPRISES TREATING SUCH MATERIALS WITH DILUTE SULFURIC ACID TO CONVERT SUCH CALCIUM COMPOUNDS TO CALCIUM SULFATE AND TO DIS-
References Cited (Backward Citations)
US2180692A
Cited
US2442429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |