Patent · US Expired

Electric light bulb

US7242138B2 · kind B2 · utility

0Cited by

8References

10Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Axel Bunk · Berlin, DE
Andreas Nittke · Pietenfeld, DE

Key dates

Filing date	Jul 4, 2003
Grant date	Jul 10, 2007
Priority date	—
Expiry date	Feb 15, 2024

Classification

Technology area (CPC H)Electricity
CPC primaryH01K1/26
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electric light bulb, in particular a halogen light bulb designed to be operated by mains voltage includes a substantially axially symmetrical bulb and a single-coil filament mounted in the bulb. The filament includes at least one incandescent coil section disposed outside the bulb axis. The incandescent coil is disposed axially in a transparent cylindrical sleeve which has an interference filter that reflects infra-red rays.

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