US2769704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing phosphate fertilizers
Assignee: Potasse et Engrais Chimiques SA
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Filing: 1952-09-24
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Granted: 1956-11-06
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Expires: 1972-09-24
Abstract
No abstract record available.
Inventors
- 👤 Louis E Andres
- 👤 Pierre G Pagny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:18
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
IN A PROCESS FOR THE MANUFACTURE OF A PHOSPHATE FERTILIZER IN WHICH NATURAL PHOSPHATE ROCK IS REACTED WITH A MINERAL ACID AND THERE IS ADDED A NEUTRALIZING AGENT TO THE MIXTURE OF SAID PHOSPHATE ROCK AND MINERAL ACID THE METHOD OF PREVENTING THE FORMATION IN THE REACTION PRODUCT OF SAID PHOSPHATE ROCK, MINERAL ACID AND NEUTRALIZING AGENT OF CALCIUM PHOSPHATE IN A FORM WHICH IS INSOLUBLE IN AMMONIUM CITRATE WHICH COMPRISES THE STEP OF ADDING TO THE MIXTURE OF PHOSPHATE ROCK AND MINERAL ACID A COMPOUND OF IRON IN AN AMOUNT TO INSURE THE PRESENCE OF AT LEAST 20 MOLS OF FE TO EACH 100 MOLS OF P2O5 PRESENT IN THE MIXTURE.
Claim 2
Dependent Claim
112 words
IN A PROCESS FOR THE MANUFACTURE OF A PHOSPHATE FERTILIZER IN WHICH NATURAL PHOSPHATE ROCK IS REACTED WITH A MINERAL ACID AND THERE IS ADDED A NEUTRALIZING AGENT TO THE MIXTURE OF SAID PHOSPHATE ROCK AND MINERAL ACID THE METHOD OF PREVENTING THE FORMATION IN THE REACTION PRODUCT OF SAID PHOSPHATE ROCK, MINERAL ACID AND NEUTRALIZING AGENT OF CALCIUM PHOSPHATE IN A FORM WHICH IS INSOLUBLE IN AMMONIUM CITRATE WHICH COMPRISES THE STEP OF ADDING TO THE MIXTURE OF PHOSPHATE ROCK AND MINERAL ACID A COMPOUND OF IRON IN AN AMOUNT TO INSURE THE PRESENCE OF AT LEAST 20 MOLS OF FE TO EACH 100 MOLS OF P2O5 PRESENT IN THE MIXTURE.
References Cited (Backward Citations)
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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) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |