Patent US2797808A successfully refreshed from Google Patents.
US2797808A
Expired / Lapsed
US
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Flotation of iron oxide and other non-sulfide minerals
Assignee: Dow Chemical Co
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Filing: 1954-03-16
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Granted: 1957-07-02
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Expires: 1974-03-16
Abstract
No abstract record available.
Inventors
- 👤 Elmer C Tveter
- 👤 John C Lokken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:24
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/002; B03D1/004; B03D1/008; B03D1/018; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
IN THE FLOTATION CONCENTRATION OF NON-SULFIDE MINERALS, SELECTED FROM THE CLASS CONSISTING OF IRON OXIDE MINERALS, MANGANESE OXIDE MINERALS AND TUNGSTIC OXIDE MINERALS, CONTAINING SOLUBLE IONS WHICH INTERFERE WITH NORMAL FLOTATION PROCEDURES, USING AN ANIONIC COLLECTOR, THE IMPROVEMENT WHICH CONSISTS IN EFFECTING THE FLOTATION OF THE NONSULFIDE MINERAL IN THE PRESENCE OF AN ADDED AMOUNT OF FROM 0.02 TO 2 POUNDS PER TON OF ORE OF A WATER-SOLUBLE INORGANIC SULFIDE.
Claim 2
Dependent Claim
70 words
IN THE FLOTATION CONCENTRATION OF NON-SULFIDE MINERALS, SELECTED FROM THE CLASS CONSISTING OF IRON OXIDE MINERALS, MANGANESE OXIDE MINERALS AND TUNGSTIC OXIDE MINERALS, CONTAINING SOLUBLE IONS WHICH INTERFERE WITH NORMAL FLOTATION PROCEDURES, USING AN ANIONIC COLLECTOR, THE IMPROVEMENT WHICH CONSISTS IN EFFECTING THE FLOTATION OF THE NONSULFIDE MINERAL IN THE PRESENCE OF AN ADDED AMOUNT OF FROM 0.02 TO 2 POUNDS PER TON OF ORE OF A WATER-SOLUBLE INORGANIC SULFIDE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |