Hydraulic fluid composition
US11261398B2 · kind B2 · utility
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45References
17Claims
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Key dates
| Filing date | Apr 19, 2017 |
| Grant date | Mar 1, 2022 |
| Priority date | — |
| Expiry date | Nov 12, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2060/09
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A hydraulic fluid includes an oil of lubricating viscosity and at least 2 wt. % of an ester of a carboxy group-containing interpolymer comprising units derived from a vinyl aromatic monomer and units derived from a carboxylic acid monomer. The interpolymer also contains nitrogen functionality. The hydraulic fluid is at least substantially free of polyacrylates and polymethacrylates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.