US2877897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for sink and float separation for minerals of small particle size
Assignee: Individual
•
Filing: 1955-12-21
•
Granted: 1959-03-17
•
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
2026-10-26 22:19
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/28; B03B5/30; B03B5/36; B03B5/38
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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 |