Patent US2968543A successfully refreshed from Google Patents.
US2968543A
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Process for the preparation of composite fertilizers containing phosphate
Assignee: Chemische Fabrik Kalk GmbH
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Filing: 1955-11-30
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Granted: 1961-01-17
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Expires: 1975-11-30
Abstract
No abstract record available.
Inventors
- 👤 Nees Hugo
- 👤 Buettgens Walter
- 👤 Geiersberger Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:39
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/04; C05B11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE PROCESS OF PRODUCING PHOSPHATE-CONTAINING FERTILIZERS IN WHICH THE RATIO OF CALCIUM OTHER THAN SULPHATE, TO THE PHOSPHORUS PENTOXIDE PRESENT IS FROM 1.5 TO 2.4, WHICH CONSISTS IN DECOMPOSING CRUDE PHOSPHATES WITH A MIXED ACID CONTAINING NITRIC ACID AND AT LEAST ONE ACID FROM THE GROUP CONSISTING OF SULPHURIC AND PHOSPHORIC ACIDS, AMMONITATING THE RESULTANT MIXTURE AND DURING THE AMMONIATION WHEN THE PH IS BETWEEN 2.5 AND 6.4, ADDING A SOLUBLE COMPOUND OF A STABILIZING METAL SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM, ALUMINUM, AND COBALT IN SUCH QUANTITY THAT IT AMOUNTS TO FROM 4 TO 8 GRAMMOLECULES OF SAID STABILIZING METAL IONS TO 100 GRAMMOLECULES OF THE TOTAL QUANTITY OF PHOSPHORUS PENTOXIDE PRESENT AND CONTINUING AMMONIATION TO COMPLETE NEUTRALIZATION.
Claim 2
Dependent Claim
120 words
THE PROCESS OF PRODUCING PHOSPHATE-CONTAINING FERTILIZERS IN WHICH THE RATIO OF CALCIUM OTHER THAN SULPHATE, TO THE PHOSPHORUS PENTOXIDE PRESENT IS FROM 1.5 TO 2.4, WHICH CONSISTS IN DECOMPOSING CRUDE PHOSPHATES WITH A MIXED ACID CONTAINING NITRIC ACID AND AT LEAST ONE ACID FROM THE GROUP CONSISTING OF SULPHURIC AND PHOSPHORIC ACIDS, AMMONITATING THE RESULTANT MIXTURE AND DURING THE AMMONIATION WHEN THE PH IS BETWEEN 2.5 AND 6.4, ADDING A SOLUBLE COMPOUND OF A STABILIZING METAL SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM, ALUMINUM, AND COBALT IN SUCH QUANTITY THAT IT AMOUNTS TO FROM 4 TO 8 GRAMMOLECULES OF SAID STABILIZING METAL IONS TO 100 GRAMMOLECULES OF THE TOTAL QUANTITY OF PHOSPHORUS PENTOXIDE PRESENT AND CONTINUING AMMONIATION TO COMPLETE NEUTRALIZATION.
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) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |