Composition for reducing evaporation at sites both on land and open water
US6558705B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Dec 20, 2000 |
| Grant date | May 6, 2003 |
| Priority date | — |
| Expiry date | Dec 20, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01G2013/004
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Parent disclosure, now U.S. Pat. No. 6,303,133 B1, taught a calcium hydroxide containing evaporation retardant having particles that mutually repel one another because of water-induced ionization. Calcium hydroxide makes the retardant unsuitable for treating overly alkaline agricultural soil, and to substitute plain calcium sulfate for calcium hydroxide would degrade the particle repulsion effect. Substitutable acidified gypsum is made by absorbing about 5 milliliters sulfuric acid per 300 grams calcium sulfate. Blending unemulsified detergent range alcohol in a parts by weight ratio of about one-to-ten with the acidified gypsum produces a soil treatment product for suppressing evaporation of water from treated soil without impairing water infiltration into the same soil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.