US2492936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential froth flotation of sulfide ores
Assignee: Individual
•
Filing: 1948-10-16
•
Granted: 1949-12-27
•
Expires: 1968-10-16
Abstract
No abstract record available.
Inventors
- 👤 Charles M Nokes
- 👤 Charles G Quigley
- 👤 Robert T Pring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:02
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/002; B03D1/004; B03D1/006; B03D1/008; B03D2201/00; B03D2201/02; B03D2201/06; B03D2203/00; B03D2203/02; Y; Y10; Y10S; Y10S209/00; Y10S209/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US745546A
Cited
US1153054A
Cited
US1414837A
Cited
US1852959A
Cited
US1833427A
Cited
US2329167A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |