Fluid loss additive for oil-based muds
US8524640B2 · kind B2 · utility
3Cited by
11References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 2, 2007 |
| Grant date | Sep 3, 2013 |
| Priority date | — |
| Expiry date | May 4, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/502
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A composition that includes a product resulting from a condensation reaction of quebracho with at least one organophilic species that includes a reactive amine is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.