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| Number | Title | Issue Date |
| 5037470 | Nutritive glasses for agriculture A vitreous product which can be used in agriculture is disclosed. With the exception of nitrogen, this vitreous product contains all the major and minor mineral elements which are essential for the nutrition of plants. The vitreous products can contain the fol... | 08/06/1991 |
| 4436546 | Fertilizer material from apatite Apatite is conventionally made into a fertilizer material by treatment with a strong acid, requiring capital-intensive industry. Hydroxyapatite is treated above 1100° C. with alkali but world reserves are problematic. The invention treats apatite at 900Â... | 03/13/1984 |
| 4363650 | Fertilizer material from apatite Apatite is conventionally made into a fertilizer material by treatment with a strong acid, requiring capital-intensive industry. Hydroxyapatite is treated above 1100 C. with alkali but world reserves are problematic. The invention treats apatite at 900 C.... | 12/14/1982 |
| 4167406 | High temperature decomposition process for producing an alkali-containing calcined phosphate fertilizer An alkaline high temperature process for the production of alkali containing highly citrate soluble calcined phosphate fertilizer is disclosed. The process comprises calcining a preheated mixture comprising a crude phosphate, an alkaline decomposing agent... | 09/11/1979 |
| 3985537 | Process for making calcined alkali phosphates of high citrate solubility for use as fertilizers Calcined alkali phosphates of high citrate solubility are made by subjecting natural calcium phosphates including tricalcium phosphate to a thermal decomposition with an aqueous alkali hydroxide solution in a revolving furnace at 900° to 1300°C in the p... | 10/12/1976 |
