Patent · US Expired

Incandescent lamp with a carbon cycle and a halogen cycle

US7402952B2 · kind B2 · utility

3Cited by

13References

18Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Axel Bunk · Berlin, DE
Matthias Damm · Gaimersheim, DE
Georg Rosenbauer · Wassertrüdingen, DE
Joachim Werner · Bethel Park, US

Key dates

Filing date	Nov 19, 2004
Grant date	Jul 22, 2008
Priority date	—
Expiry date	Mar 3, 2026

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02B20/00
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The incandescent lamp, which uses a carbon cycle process, is equipped with a luminous body which, together with a fill, is introduced in a vacuum-tight manner into a bulb, the luminous body including a metal carbide, the melting point of which is above that of tungsten. The distance between the luminous body and the wall of the bulb is less than 18 mm, with a first cycle process, which is attributed to the carbon, being effected by the use of carbon and hydrogen as fill additive, and a second cycle process, which is attributed to the metal, being effected by the use of halogen.

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