US2643948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a fertilizer from phosphate rock
Assignee: D'ETUDES CHIMIQUES POUR L'INDUSTRIE ET L'AGRICULTURE Ste
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Filing: 1950-03-24
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Granted: 1953-06-30
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Expires: 1970-03-24
Abstract
No abstract record available.
Inventors
- 👤 Sourdet Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:14
CPC Classifications
C; C05; C05B; C05B13/00; C05B13/02; Y; Y10; Y10S; Y10S71/00; Y10S71/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
METHOD OF TREATING NATURAL PHOSPHATES FOR THE PRODUCTION OF PHOSPHATE FERTILIZERS, WHICH COMPRISES HEATING THE NATURAL PHOSPHATE IN A TEMPERATURE REANGE OF 1100* C. TO 1200* C. WITH AN ALKALI METAL SALT TO OBTAIN A DOUBLE CALCIUM AND ALKALI METAL PHOSPHATE, HYDROLYZING THE SAID DOUBLE PHOSPHATE TO OBTAIN A CALCIUM PHOSPHATE FERTILIZER HAVING HIGH SOLUBILITY INCITRIC ACID SOLUTIONS, AND A CONCENTRATED ALKALINE SOLUTION, AND RECOVERING THE CONTENT OF THE ALKALI METAL COMPOUND PRESENT IN SAID ALKALINE SOLUTION.
Claim 2
Dependent Claim
77 words
METHOD OF TREATING NATURAL PHOSPHATES FOR THE PRODUCTION OF PHOSPHATE FERTILIZERS, WHICH COMPRISES HEATING THE NATURAL PHOSPHATE IN A TEMPERATURE REANGE OF 1100* C. TO 1200* C. WITH AN ALKALI METAL SALT TO OBTAIN A DOUBLE CALCIUM AND ALKALI METAL PHOSPHATE, HYDROLYZING THE SAID DOUBLE PHOSPHATE TO OBTAIN A CALCIUM PHOSPHATE FERTILIZER HAVING HIGH SOLUBILITY INCITRIC ACID SOLUTIONS, AND A CONCENTRATED ALKALINE SOLUTION, AND RECOVERING THE CONTENT OF THE ALKALI METAL COMPOUND PRESENT IN SAID ALKALINE 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) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |