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Patent US2459868A successfully refreshed from Google Patents.
US2459868A
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Method for recovering tungsten values from ore
Assignee: UNITED STATES VANADIUM Corp
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Filing: 1942-08-14
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Granted: 1949-01-25
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Expires: 1962-08-14
Abstract
No abstract record available.
Inventors
- 👤 Burwell Blair
- 👤 Joseph H Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:35
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1335277A
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US1261383A
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US1293404A
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US1388857A
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US1796026A
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US2273930A
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US2285394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-25 | 1952-07-26 | 1953-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-25 | 1956-07-26 | 1957-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-25 | 1960-07-26 | 1961-01-25 | $7700.00 | Window Closed / Lapsed |