Slow release fertilizers
US5454851A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1994 |
| Grant date | Oct 3, 1995 |
| Priority date | — |
| Expiry date | Feb 16, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05G5/30
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An encapsulated slow-release particulate fertilizer product comprising 50-95% by weight of fertilizer and an encapsulating waterproofing sulfurated coat selected from the group of sulfurated unsaturated oils and sulfurated distillation products and distillation residues thereof. The sulfurated coat may bear neutralized carboxylic groups and the product may optionally contain up to 5% by weight of an inert powder serving as conditioner. For making the product an unsaturated oil or a distillation product or residue thereof is reacted with a sulfurization agent and the reaction product is used for the encapsulation of a particulate fertilizer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.