US2433258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Froth flotation of nonsulfide ores with a mixture of oil-soluble and water-soluble petroleum sulfonates
Assignee: Wyeth Holdings LLC
•
Filing: 1944-02-04
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Granted: 1947-12-23
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Expires: 1964-02-04
Abstract
No abstract record available.
Inventors
- 👤 Booth Robert Ben
- 👤 Herkenhoff Earl Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:40
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/012; B03D1/02; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04; Y; Y10; Y10S; Y10S209/00; Y10S209/902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1170665A
Cited
GB350505A
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US2053007A
Cited
US2310240A
Cited
GB538408A
Cited
US2303931A
Cited
US2262926A
Cited
US2391087A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-22 | 1951-06-23 | 1951-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-22 | 1955-06-23 | 1955-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-22 | 1959-06-23 | 1959-12-23 | $7700.00 | Window Closed / Lapsed |