US2407651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentrating fluorspar by froth flotation
Assignee: National Aeronautics and Space Administration
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Filing: 1944-11-01
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Granted: 1946-09-17
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Expires: 1964-11-01
Abstract
No abstract record available.
Inventors
- 👤 Clemmer Julius Bruce
- 👤 Ballard H Clemmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:47
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/001; B03D1/004; B03D1/016; B03D1/08; B03D1/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-09-16 | 1950-03-18 | 1950-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-09-16 | 1954-03-18 | 1954-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-09-16 | 1958-03-18 | 1958-09-17 | $7700.00 | Window Closed / Lapsed |