Patent · US Expired

Heatable electrode for high-pressure gas discharge lamps

US4839560A · kind A · utility

0Cited by

3References

4Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Hans G. Ganser · Stolberg, DE
Ralf Schafer · Marbach, DE
Hans Peter Stormberg · Stolberg, DE

Key dates

Filing date	Mar 1, 1985
Grant date	Jun 13, 1989
Priority date	—
Expiry date	Mar 1, 2005

Classification

Technology area (CPC H)Electricity
CPC primaryH01J61/0732
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electrode having a self-supporting cylindrical open coil of tungsten or molybdenum wire having a lead wire of tungsten or molybdenum passed coaxially through the coil and connected thereto. The turns of the coil engage each other. The central lead wire has a smaller diameter than the coil wire, this thin portion extending to a location just before the outermost turn of the coil.

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