US3141734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of clarifying acidic phosphatic solutions
Assignee: International Minerals and Chemical Corp
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Filing: 1960-10-25
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Granted: 1964-07-21
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Expires: 1980-10-25
Abstract
No abstract record available.
Inventors
- 👤 Ittlinger Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:24
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234; C01B25/235
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
THE METHOD OF REDUCING THE QUANTITY OF SOLIDS POSTPRECIPITATED FROM AN AQUEOUS ACIDIC INORGANIC PHOSPHATIC SOLUTION, SAID SOLUTION BEING CHARACTERIZED BY A CAO TO P2O5 MOLE RATIO IN THE RANGE OF 0--1 TO 1--1, WHICH SOLUTION NORMALLY POST-PRECIPITATES SALTS OF IRON AND ALUMINUM COMPRISING ADDING TO SAID SOLUTION A SILICOFLUORIDE CLARIFICATION AGENT CAPABLE OF PROVIDING SILICOFLUORIDE IONS, SAID AGENT BEING MORE SOLUBLE IN SAID SOLUTION THAN SODIUM SILICOFLUORIDE AND MORE SOLUBLE IN SAID SOLUTION THAN POTASSIUM SILICOFLUORIDE AND BEING ADDED IN A MINOR AMOUNT SUFFICIENT TO PRECIPITATE IN SUBSTANTIAL QUANTITIES AN IMPURITY CONTAINING IONS OF THE GROUP CONSISTING OF SODIUM AND POTASSIUM IONS FROM SAID SOLUTION, AND THEREAFTER SEPARATING SAID PRECIPITATED IMPURITY FROM SAID SOLUTION.
Claim 2
Independent Claim
115 words
THE METHOD OF REDUCING THE QUANTITY OF SOLIDS POSTPRECIPITATED FROM AN AQUEOUS ACIDIC INORGANIC PHOSPHATIC SOLUTION, SAID SOLUTION BEING CHARACTERIZED BY A CAO TO P2O5 MOLE RATIO IN THE RANGE OF 0--1 TO 1--1, WHICH SOLUTION NORMALLY POST-PRECIPITATES SALTS OF IRON AND ALUMINUM COMPRISING ADDING TO SAID SOLUTION A SILICOFLUORIDE CLARIFICATION AGENT CAPABLE OF PROVIDING SILICOFLUORIDE IONS, SAID AGENT BEING MORE SOLUBLE IN SAID SOLUTION THAN SODIUM SILICOFLUORIDE AND MORE SOLUBLE IN SAID SOLUTION THAN POTASSIUM SILICOFLUORIDE AND BEING ADDED IN A MINOR AMOUNT SUFFICIENT TO PRECIPITATE IN SUBSTANTIAL QUANTITIES AN IMPURITY CONTAINING IONS OF THE GROUP CONSISTING OF SODIUM AND POTASSIUM IONS FROM SAID SOLUTION, AND THEREAFTER SEPARATING SAID PRECIPITATED IMPURITY FROM SAID SOLUTION.
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) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |