US2976141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of values from phosphate rock
Assignee: Individual
•
Filing: 1957-09-09
•
Granted: 1961-03-21
•
Expires: 1977-09-09
Abstract
No abstract record available.
Inventors
- 👤 John N Carothers
- 👤 Jr Rudolph J Hurka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:58
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/04; C05B11/08; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/32; C01B25/324; Y; Y10; Y10S; Y10S71/00; Y10S71/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
IN A PROCESS OF RECOVERING VALUES FROM HIGH GRADE FLORIDA PHOSPHATE ROCK, REACTING THE PHOSPHATE ROCK WITH SULFURIC ACID AS THE ONLY ACID LIMITED TO AN AMOUNT APPROXIMATELY 80% OF THAT REQUIRED TO CONVERT THE P2O5 CONTENT OF THE ROCK OF PHOSPHORIC ACID AND IN THE PRESENCE OF SUFFICIENT WATER TO FORM A FILTERABLE SOLUTION, SEPARATING THE RESULTING SOLIDS FROM THE SOLUTION, SAID SOLUTION CONTAINING FROM 7% TO 16% P2O5, FROM 0.2% TO 1.7% FLORINE, FROM 0.034 TO 0.2% ALUMINUM TOGETHER WITH SULFATE, CALCIUM, AND RARE EARTHS, THE SULFATE BEING IN AN AMOUNT WHEREBY THE SO4-/AL WEIGHT RATIO IN THE SOLUTION IN ATL LEAST TWO AND ONE HALF PARTS SULFATE TO ONE PART ALUMINUM, THEREBY TO PRECIPATE FLUOMETALLIC COMPOUNDS IN THE FORM OF OCTAHEDRAL CRYSTALS CONTAINING ALUMINUM FLUORINE CALCIUM AND SULFATE, AND SEPARATING THE CRYSTALS FROM THE SOLUTION.
Claim 2
Dependent Claim
138 words
IN A PROCESS OF RECOVERING VALUES FROM HIGH GRADE FLORIDA PHOSPHATE ROCK, REACTING THE PHOSPHATE ROCK WITH SULFURIC ACID AS THE ONLY ACID LIMITED TO AN AMOUNT APPROXIMATELY 80% OF THAT REQUIRED TO CONVERT THE P2O5 CONTENT OF THE ROCK OF PHOSPHORIC ACID AND IN THE PRESENCE OF SUFFICIENT WATER TO FORM A FILTERABLE SOLUTION, SEPARATING THE RESULTING SOLIDS FROM THE SOLUTION, SAID SOLUTION CONTAINING FROM 7% TO 16% P2O5, FROM 0.2% TO 1.7% FLORINE, FROM 0.034 TO 0.2% ALUMINUM TOGETHER WITH SULFATE, CALCIUM, AND RARE EARTHS, THE SULFATE BEING IN AN AMOUNT WHEREBY THE SO4-/AL WEIGHT RATIO IN THE SOLUTION IN ATL LEAST TWO AND ONE HALF PARTS SULFATE TO ONE PART ALUMINUM, THEREBY TO PRECIPATE FLUOMETALLIC COMPOUNDS IN THE FORM OF OCTAHEDRAL CRYSTALS CONTAINING ALUMINUM FLUORINE CALCIUM AND SULFATE, AND SEPARATING THE CRYSTALS FROM THE SOLUTION.
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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) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |