Sulfur encapsulation of fertilizers to provide controlled dissolution rates
Abstract
Abstract CERTAIN FINELY DIVIDED POWDERS HAVE BEEN FOUND TO BE UNUSUALLY EFFECTIVE IN REDUCING THE CONTACT ANGLE BETWEEN THE SURFACE OF SOLID FERTILIZER PELLETS AND MOLTEN SULFUR, THE EFFECT OF WHICH PHENOMENON ALLOWS MOLTEN SULFUR TO "WET" THE SURFACE OF THE FERTILIZER PELLETS MORE EASILY, WHEN A THIN LAYER OF THE FINELY DIVIDED POWDER IS INTERPOSED BETWEEN THE FERTILIZER SURFACE AND THE MOLTEN SULFUR. BY USING A SMALL AMOUNT OF ONE OF THESE FINELY DIVIDED POWDERS AS A SUBCOATING IMMEDIATELY ADJACENT TO AND SURROUNDING EACH FERTILIZER PELLET, IT IS POSSIBLE TO PRODUCE SULFURENCAPSULATED FERTILIZER PELLETS ADAPTED FOR USE IN SOIL TO PROVIDE A CONTROLLED RELEASE OF THE FERTILIZER NUTRIENTS AT A RATE PREDETERMINED FOR THE METABOLIC NEEDS OF A PARTICULAR CROP PLANT, USING MUCH LESS SULFUR THAN WOULD BE REQUIRED TO ACHIEVE COMPARABLE RESULTS ABSENT THE POWDERSUBCOAT.
Inventors
- 👤 Paul S Fleming
Bibliographic Details
Claims Analysis
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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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |