Patent · US Expired

Process for the production of a transformer oil

US4303499A · kind A · utility

1Cited by

3References

7Claims

0Family size

Assignee

Deutsche Texaco Aktiengesellschaft · DE

Inventors

Walter Geistert
Ulrich Kramer · Bensberg, DE
Gottfried Klippel · Reinbek, DE

Key dates

Filing date	Feb 9, 1979
Grant date	Dec 1, 1981
Priority date	—
Expiry date	Feb 9, 1999

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC10G2400/12
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A process is provided for the production of a stable, age-resisting mineral oil composition which comprises subjecting a paraffin base mineral crude oil to distillation to produce a distillate fraction boiling in the range of 270.degree. to 400.degree. C., solvent dewaxing said distillate fraction, solvent extracting said dewaxed distillate portion to produce a solvate fraction and an extract fraction, refining said solvate fraction, concentrating and refining said extract fraction and adding said refined, concentrated extract portion with said refined solvate fraction.

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