US2553905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration of phosphate minerals
Assignee: American Agricultural Chemical Co
•
Filing: 1946-12-06
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Granted: 1951-05-22
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Expires: 1966-12-06
Abstract
No abstract record available.
Inventors
- 👤 Robert D Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:07
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/021; Y; Y10; Y10S; Y10S209/00; Y10S209/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
IN A METHOD OF CONCENTRATING PHOSPHATE MINERAL IN ORE CONTAINING SILICA, THE STEPS OF PREPARING A SILICA-FLOATING REAGENT BY REACTING IN AN AQUEOUS MEDIUM A SOLUBLE SALT OF AN AMINE HAVING A COMPOSITION CONTAINING 8 TO 22 CARBON ATOMS AND CHARACTERISTIC OF A SILICA-FLOATING AMINE REAGENT, WITH A SOLUBLE REAGENT CONTAINING SULFATE ION AND ADAPTED TO CONVERT SAID AMINE SALT INTO AN INSOLUBLE SILICA-FLOATING AMINE REAGENT CONSISTING OF AN INSOLUBEL AMINE SALT, TO PRODUCE A DIFFUSE, FINELY DIVIDED PRECIPITATE OF SAID INSOLUBLE AMINE SALT, IMMEDIATELY INTRODUCING SAID PRECIPITATE WHILE CARRIED IN SAID AQUEOUS MEDIUM, INTO A PULP OF THE AFORESAID ORE, AND IMMEDIATELY AND WITHOUT INTERMEDIATE AGITATION SUBJECTING THE PULP TO FLOTATION OPERATION IN THE PRESENCE OF KEROSENE TO SEPARATE A SILICA FLOAT LEAVING A PHOSPHATE-ENRICHED, NON-FLOATED PORTION OF THE PULP.
Claim 2
Dependent Claim
131 words
IN A METHOD OF CONCENTRATING PHOSPHATE MINERAL IN ORE CONTAINING SILICA, THE STEPS OF PREPARING A SILICA-FLOATING REAGENT BY REACTING IN AN AQUEOUS MEDIUM A SOLUBLE SALT OF AN AMINE HAVING A COMPOSITION CONTAINING 8 TO 22 CARBON ATOMS AND CHARACTERISTIC OF A SILICA-FLOATING AMINE REAGENT, WITH A SOLUBLE REAGENT CONTAINING SULFATE ION AND ADAPTED TO CONVERT SAID AMINE SALT INTO AN INSOLUBLE SILICA-FLOATING AMINE REAGENT CONSISTING OF AN INSOLUBEL AMINE SALT, TO PRODUCE A DIFFUSE, FINELY DIVIDED PRECIPITATE OF SAID INSOLUBLE AMINE SALT, IMMEDIATELY INTRODUCING SAID PRECIPITATE WHILE CARRIED IN SAID AQUEOUS MEDIUM, INTO A PULP OF THE AFORESAID ORE, AND IMMEDIATELY AND WITHOUT INTERMEDIATE AGITATION SUBJECTING THE PULP TO FLOTATION OPERATION IN THE PRESENCE OF KEROSENE TO SEPARATE A SILICA FLOAT LEAVING A PHOSPHATE-ENRICHED, NON-FLOATED PORTION OF THE PULP.
References Cited (Backward Citations)
US2222728A
Cited
US2343221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |