US2818976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of naphthenic amines in phosphate flotation
Assignee: General Mills Inc
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Filing: 1954-11-18
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Granted: 1958-01-07
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Expires: 1974-11-18
Abstract
No abstract record available.
Inventors
- 👤 Thomas H Lentz
- 👤 Wittcoff Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:44
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/01; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/06; Y; Y10; Y10S; Y10S209/00; Y10S209/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS FOR THE TREATMENT OF PHOSPHATE ORE FOR THE SEPARATION OF PHOSPHATE MINERALS FROM PULP MIXTURES CONTAINING THE SAME TOGETHER WITH SILICA AND OTHER IMPURITIES, WHICH COMPRISES ADDING TO THE PULP A SMALL AMOUNT OF A NAPHTHENIC AMINE, SUBJECTING THE MIXTURE TO A FROTH FLOTATION OPERATION, SEPARATING SILICA AND OTHER IMPURITIES AS FROTH AND RECOVERING THE PHOSPHATE MINERALS IN THE UNDERFLOW.
Claim 2
Dependent Claim
62 words
A PROCESS FOR THE TREATMENT OF PHOSPHATE ORE FOR THE SEPARATION OF PHOSPHATE MINERALS FROM PULP MIXTURES CONTAINING THE SAME TOGETHER WITH SILICA AND OTHER IMPURITIES, WHICH COMPRISES ADDING TO THE PULP A SMALL AMOUNT OF A NAPHTHENIC AMINE, SUBJECTING THE MIXTURE TO A FROTH FLOTATION OPERATION, SEPARATING SILICA AND OTHER IMPURITIES AS FROTH AND RECOVERING THE PHOSPHATE MINERALS IN THE UNDERFLOW.
References Cited (Backward Citations)
US2217685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |