Patent · US Expired

Discharge lamp having spring

US6614166B2 · kind B2 · utility

2Cited by

4References

7Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Achim Hilscher · Friedberg, DE
Thomas Noll · Kipfenberg, DE

Key dates

Filing date	Dec 13, 2001
Grant date	Sep 2, 2003
Priority date	—
Expiry date	Dec 27, 2021

Classification

Technology area (CPC H)Electricity
CPC primaryH01J61/327
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The compact low-pressure discharge lamp (1) has a wound tubular discharge vessel (2) with at least four straight tubes (6, 7) which are in a polygonal arrangement and, close to or at the ends of the straight tubes (6, 7), are connected by transverse connections (8, 10, 11) to form a single continuous discharge path which is closed off in a gastight manner. A coil spring (14) made from metal, which runs parallel to the tubes (6, 7) is arranged in the center of the cylindrical cavity (13) formed by the straight tubes (6, 7) of the discharge vessel (2). The coil spring (14) reduces the firing voltage required.

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