US2459219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration of nonsulfide, nonsilicate ores with nitric acid treated fatty acids
Assignee: Minerals Separation North American Corp
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Filing: 1946-02-02
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Granted: 1949-01-18
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Expires: 1966-02-02
Abstract
No abstract record available.
Inventors
- 👤 James B Duke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:59
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/01; B03D1/008; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/005; B03D2203/02; B03D2203/04; B03D2203/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-18 | 1952-07-19 | 1953-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-18 | 1956-07-19 | 1957-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-18 | 1960-07-19 | 1961-01-18 | $7700.00 | Window Closed / Lapsed |