Controlled release fertilizer
US4023955A · kind A · utility
19Cited by
5References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 4, 1974 |
| Grant date | May 17, 1977 |
| Priority date | — |
| Expiry date | Oct 4, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05G5/30
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A solid controlled release fertilizer of a discrete particle of a fertilizer material encapsulated within a coating of partially hydrated cement is provided. In a preferred embodiment, the partially hydrated cement coated fertilizer particle is encapsulated within a thin semipermeable elastomer coating. In another embodiment, the thin semipermeable elastomer is in turn encapsulated within a second partially hydrated cement coating which contains micronutrient trace elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.