Substituted cellulose acetates and uses thereof
US9167830B2 · kind B2 · utility
4Cited by
57References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2012 |
| Grant date | Oct 27, 2015 |
| Priority date | — |
| Expiry date | Jan 27, 2032 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/10
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The present invention relates to substituted cellulose acetates and methods of use thereof. One embodiment of the present invention provides a drilling fluid having a base fluid and a viscosifier having a substituted cellulose acetate having a polar substituent that comprises an oxygen atom covalently bonded to a nonmetal selected from the group of sulfur, phosphorus, boron, and chlorine; where the nonmetal is present in at least about 0.01% by weight of the substituted cellulose acetate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.