Patent US4334788A successfully refreshed from Google Patents.
Patent US1974885A successfully refreshed from Google Patents.
US1974885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Froth flotation of oxidized ores
Assignee: Individual
•
Filing: 1932-01-21
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Granted: 1934-09-25
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Expires: 1952-01-21
Abstract
No abstract record available.
Inventors
- 👤 George H Wigton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:17
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/014; B03D2203/00; B03D2203/02; B03D2203/025
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) | 1937-09-24 | 1938-03-26 | 1938-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-09-24 | 1942-03-26 | 1942-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-09-24 | 1946-03-26 | 1946-09-25 | $7700.00 | Window Closed / Lapsed |