Patent · US Active

Use of polyesters as viscosity index improvers for aircraft hydraulic fluids

US11339346B2 · kind B2 · utility

0Cited by

6References

15Claims

0Family size

Assignee

Evonik Operations GmbH · DE

Inventors

Stefan Karl Maier · Ober-Ramstadt, DE
Nicolai Kolb · Recklinghausen, DE
Michael Neusius · Darmstadt, DE

Key dates

Filing date	Dec 12, 2017
Grant date	May 24, 2022
Priority date	—
Expiry date	Mar 22, 2038

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC10N2040/08
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

The invention is related to a composition for use in hydraulic systems of an aircraft. The composition typically comprises an adipic acid-based polyester in a phosphate ester base stock substantially consisting of trialkyl phosphates.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.