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Patent US2771354A successfully refreshed from Google Patents.
US2771354A
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Concentration of iron ores
Assignee: NL Industries Inc
•
Filing: 1953-06-01
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Granted: 1956-11-20
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Expires: 1973-06-01
Abstract
No abstract record available.
Inventors
- 👤 Moklebust Olav
- 👤 Oppegaard Assur Gjessing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:46
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C21; C21B; C21B13/00; C22B1/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2108043A
Cited
US2523138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |