Patent EP0025823A2 successfully refreshed from Google Patents.
Patent US2877897A successfully refreshed from Google Patents.
US2877897A
Expired / Lapsed
US
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Method and apparatus for sink and float separation for minerals of small particle size
Assignee: Individual
•
Filing: 1955-12-21
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Granted: 1959-03-17
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Expires: 1975-12-21
Abstract
No abstract record available.
Inventors
- 👤 Nelson L Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:48
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/28; B03B5/30; B03B5/36; B03B5/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1614876A
Cited
US2203601A
Cited
US2363066A
Cited
US2552378A
Cited
US2590756A
Cited
US2621791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |