Microencapsulated oil field chemicals
US6326335A · kind A · utility
57Cited by
4References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1999 |
| Grant date | Dec 4, 2001 |
| Priority date | — |
| Expiry date | Jul 13, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2984
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Gelatin capsules containing oil field chemicals, preferably weighted with a heavy metal compound, are made more stable under certain conditions by the incorporation of a strong chelating agent. The microcapsules can provide an extended treatment period since many materials that would damage the microcapsules are controlled by the chelating agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.