Patent · US Expired

Self-healing electrical capacitor and method for its production

US4121274A · kind A · utility

6Cited by

1References

6Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Reiner Simson · Heidenheim, DE
Karl-Heinz Schindhelm · Herbrechtingen, DE
Werner Vogel · Jena, DE

Key dates

Filing date	Apr 18, 1977
Grant date	Oct 17, 1978
Priority date	—
Expiry date	Apr 18, 1997

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/435
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A self-healing electrical coil capacitor, in particular for AC applications, comprising dielectric films of polypropylene. Metal coatings are provided on the films and exposed margins are left at the longitudinal sides of the films. The films are swelled in the region of the exposed margins. As a result, the previously observed decrease in capacity which occurred during the operation of such AC capacitors can be eliminated to a large extent.

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