US2759795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Defluorination of phosphatic materials
Assignee: International Minerals and Chemical Corp
•
Filing: 1950-09-26
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Granted: 1956-08-21
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Expires: 1970-09-26
Abstract
No abstract record available.
Inventors
- 👤 James R Archer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:22
CPC Classifications
C; C05; C05B; C05B1/00; C05B1/02; 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
90 words
A PROCESS FOR DEFLUORINATING ACID PHOSPHATE WHICH COMPRISES SEPARATING A SOLUTION HAVING A CAO/P2O5 MOLE RATIO IN THE RANGE BETWEEN ABOUT 0.1 AND ABOUT 0.6 FROM THE SOLID CALCIUM SULFATE OF A SLURRY PREPARED BY LEACHING A SULFURIC ACID-PHOSPHATE ROCK MIX, THE PHOSPHATE ROCK CONTAINING CHEMICALLY BOUND FLUORINE, WITH A LIQUID SELECTED FROM THE GROUP CONSISTING OF WATER AND AN AQUEOUS SOLUTION COMPRISING ESSENTIALLY WATER, MONOCALCIUM PHOSPHATE AND FREE PHOSPHORIC ACID, AND HEATING SAID SOLUTION AT A TEMPERATURE BETWEEN ABOUT 100* C. AND ABOUT 200* C. TO EVOLVE FLUORINE CONSTITUENTS.
Claim 2
Dependent Claim
90 words
A PROCESS FOR DEFLUORINATING ACID PHOSPHATE WHICH COMPRISES SEPARATING A SOLUTION HAVING A CAO/P2O5 MOLE RATIO IN THE RANGE BETWEEN ABOUT 0.1 AND ABOUT 0.6 FROM THE SOLID CALCIUM SULFATE OF A SLURRY PREPARED BY LEACHING A SULFURIC ACID-PHOSPHATE ROCK MIX, THE PHOSPHATE ROCK CONTAINING CHEMICALLY BOUND FLUORINE, WITH A LIQUID SELECTED FROM THE GROUP CONSISTING OF WATER AND AN AQUEOUS SOLUTION COMPRISING ESSENTIALLY WATER, MONOCALCIUM PHOSPHATE AND FREE PHOSPHORIC ACID, AND HEATING SAID SOLUTION AT A TEMPERATURE BETWEEN ABOUT 100* C. AND ABOUT 200* C. TO EVOLVE FLUORINE CONSTITUENTS.
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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) | 1959-08-21 | 1960-02-20 | 1960-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-21 | 1964-02-20 | 1964-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-21 | 1968-02-20 | 1968-08-21 | $7700.00 | Window Closed / Lapsed |