Phosphate fertilizer products
Abstract
Abstract REACTION OF PHOSPHATE ROCK AND/OR DERIVATIVES THEREOF WITH PHOSPHORIC ACID OR MIXTURES THEREOF WITH SULFURIC ACID AND POTASSIUM BISULFATE AND/OR POTASSIUM SULFATE. THERE IS ALSO DISCLOSED A POTASSIUM POLYPHOSPHATE DESIGNATED POTASSIUM ANHYDROPHOSPHATE OF VARYING WATER SOLUBILITY AND MOLECULAR WEIGHT. THESE PRODUCT MIXTURES EXHIBIT EXCELLENT SOLUBILITY PROPERTIES FOR USE AS CONTROLLEDRELEASE FERTILIZER MATERIALS. FERTILIZER PRODUCTS HAVING CONTROLLED WATER SOLUBILITIES AND MOLECULAR WEIGHTS WHICH COMPRISE POLYMERIC REACTION PRODUCTS OF POTASSIUM DIHYDROGEN PHOSPHATE AND POTASSIUM MONOHYDROGEN PHOSPHATE HAVING MOLECULAR WEIGHTS OF ABOUT 20,000 TO 80,000, PRODUCED IN THE TEMPERATURE RANGE OF 250 TO 850*C. THE PRODUCTS ARE UNIQUE IN THAT THE SOLUBILITY IN WATER CAN BE PREDETERMINED AND CONTROLLED BY REGULATION OF THE REACTANT AMOUNTS AND REACTION CONDITIONS. THE POTASSIUM DIHYDROGEN PHOSPHATE AND POTASSIUM MONOHYDROGEN PHOSPHATE MIXTURES ARE PRODUCED BY MIXING OR THE MIXTURES MAY BE PRODUCED BY A
Inventors
- 👤 Erhart K Drechsel
- 👤 John B Sardisco
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |