US2461875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Froth flotation of iron ores
Assignee: Wyeth Holdings LLC
•
Filing: 1944-02-14
•
Granted: 1949-02-15
•
Expires: 1964-02-14
Abstract
No abstract record available.
Inventors
- 👤 Booth Robert Ben
- 👤 Herkenhoff Earl Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:24
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/012; B03D1/002; B03D1/018; B03D1/02; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1170637A
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US1170665A
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US2112362A
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US2162494A
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US2105827A
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US2145848A
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US2120217A
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US2337722A
Cited
US2410376A
Cited
US2410377A
Cited
US2385054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-02-15 | 1952-08-16 | 1953-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-15 | 1956-08-16 | 1957-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-15 | 1960-08-16 | 1961-02-15 | $7700.00 | Window Closed / Lapsed |