US2889217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing defluorinated phosphate material
Assignee: International Minerals and Chemical Corp
•
Filing: 1954-04-12
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Granted: 1959-06-02
•
Expires: 1974-04-12
Abstract
No abstract record available.
Inventors
- 👤 Baron Ira Milton Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:04
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/32; C01B25/328; Y; Y10; Y10S; Y10S71/00; Y10S71/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A METHOD OF PRODUCING DEFLUORINATED PHOSPHATIC MATERIAL WHICH COMPRISES PRECIPITATING THE FLUORINE IMPURITIES FROM FLUORINE-CONTAINING ACIDIC PHOSPHORUS-BEARING SOLUTIONS WITH CALCIUM CARBONATE, SEPARATELY RECOVERING A SOLUTION AND FLUORINE-CONTAINING PRECIPITATED SOLIDS, PREPARING AN IMPURE FLUORINE-CONTAINING ACIDIC PHOSPHORUSBEARING SOLUTION OF CAO/P2O5 MOL RATIO OF LESS THAN ABOUT 0.4, ADMIXING THE SOLUTION OF CAO/P2O5 MOL RATIO OF LESS THAN ABOUT 0.4 AND THE AFOREMENTIONED FLUORINECONTAINING PRECIPITATED SOLIDS TO PRODUCE A MIXTURE HAVING A CAO/P2O5 MOLE RATIO OF BETWEEN ABOUT 0.6 AND ABOUT 1.2, DRYING AND CALCINING SAID MIXTURE AT A TEMPERATURE OF AT LEAST ABOUT 325*C. TO REMOVE MOISTURE AND TO EVOLVE FLUORINE, AND HYDROLYZING THE HEAT TREATED PRODUCT IN THE PRESENCE OF STEAM TO RECONVERT THE P2O5 CONTENT TO THE ORTHOPHOSPHATE FORM.
Claim 2
Independent Claim
119 words
A METHOD OF PRODUCING DEFLUORINATED PHOSPHATIC MATERIAL WHICH COMPRISES PRECIPITATING THE FLUORINE IMPURITIES FROM FLUORINE-CONTAINING ACIDIC PHOSPHORUS-BEARING SOLUTIONS WITH CALCIUM CARBONATE, SEPARATELY RECOVERING A SOLUTION AND FLUORINE-CONTAINING PRECIPITATED SOLIDS, PREPARING AN IMPURE FLUORINE-CONTAINING ACIDIC PHOSPHORUSBEARING SOLUTION OF CAO/P2O5 MOL RATIO OF LESS THAN ABOUT 0.4, ADMIXING THE SOLUTION OF CAO/P2O5 MOL RATIO OF LESS THAN ABOUT 0.4 AND THE AFOREMENTIONED FLUORINECONTAINING PRECIPITATED SOLIDS TO PRODUCE A MIXTURE HAVING A CAO/P2O5 MOLE RATIO OF BETWEEN ABOUT 0.6 AND ABOUT 1.2, DRYING AND CALCINING SAID MIXTURE AT A TEMPERATURE OF AT LEAST ABOUT 325*C. TO REMOVE MOISTURE AND TO EVOLVE FLUORINE, AND HYDROLYZING THE HEAT TREATED PRODUCT IN THE PRESENCE OF STEAM TO RECONVERT THE P2O5 CONTENT TO THE ORTHOPHOSPHATE FORM.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |