US2748939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphate recovery in reverse flotation using a fluosilicate to deactivate the reagents
Assignee: JBS USA LLC
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Filing: 1955-01-24
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Granted: 1956-06-05
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Expires: 1975-01-24
Abstract
No abstract record available.
Inventors
- 👤 William A Hodges
- 👤 Joseph E Floyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:16
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/002; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/06; Y; Y10; Y10S; Y10S209/00; Y10S209/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
IN A PROCESS FOR CONCENTRATING PHOSPHATE VALUES FROM PHOSPHATE ORE BY A REVERSE FLOTATION PROCESS WHEREIN A NEGATIVE-ION REAGENT IS USED TO SEPARATE A ROUGHER CONCENTRATE RICH IN PHOSPHATE AND LEAN IN, SILICIOUS IMPURITIES, THE NEGATIVE-ION REAGENT DEACTIVATED AND A POSITIVEION REAGENT USED TO SEPARATE THE SILICIOUS IMPURITIES FROM THE PHOSPHATE, THE IMPROVEMENT WHICH COMPRISES TREATING THE ROUGHER CONCENTRATE WITH A WATER-SOLUBLE FLUOSILICATE OT DEACTIVATE SAID NEGATIVE-ION REAGENT PRIOR TO SEPARATING THE SILICIOUS IMPURITIES WITH THE POSITIVE-ION REAGENTS.
Claim 2
Dependent Claim
78 words
IN A PROCESS FOR CONCENTRATING PHOSPHATE VALUES FROM PHOSPHATE ORE BY A REVERSE FLOTATION PROCESS WHEREIN A NEGATIVE-ION REAGENT IS USED TO SEPARATE A ROUGHER CONCENTRATE RICH IN PHOSPHATE AND LEAN IN, SILICIOUS IMPURITIES, THE NEGATIVE-ION REAGENT DEACTIVATED AND A POSITIVEION REAGENT USED TO SEPARATE THE SILICIOUS IMPURITIES FROM THE PHOSPHATE, THE IMPROVEMENT WHICH COMPRISES TREATING THE ROUGHER CONCENTRATE WITH A WATER-SOLUBLE FLUOSILICATE OT DEACTIVATE SAID NEGATIVE-ION REAGENT PRIOR TO SEPARATING THE SILICIOUS IMPURITIES WITH THE POSITIVE-ION REAGENTS.
References Cited (Backward Citations)
US2414815A
Cited
US2469422A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |