US2687213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Froth flotation process and apparatus
Assignee: Individual
•
Filing: 1952-01-07
•
Granted: 1954-08-24
•
Expires: 1972-01-07
Abstract
No abstract record available.
Inventors
- 👤 Norman A Macleod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:22
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/1412; B03D1/1443; B03D1/1462; B03D1/1493; B03D1/24; B03D1/245; B03D1/26
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-23 | 1958-02-22 | 1958-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-23 | 1962-02-22 | 1962-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-23 | 1966-02-22 | 1966-08-24 | $7700.00 | Window Closed / Lapsed |