Patent · US Expired

Electric incandescent halogen lamp with barrel-shaped bulb

US5811934A · kind A · utility

12Cited by

6References

14Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Axel Bunk · Berlin, DE
Andreas Hollstein · Ingolstadt, DE
Ulrich Binder · Ennigerloh, DE

Key dates

Filing date	Nov 25, 1996
Grant date	Sep 22, 1998
Priority date	—
Expiry date	Nov 25, 2016

Classification

Technology area (CPC H)Electricity
CPC primaryH01K1/28
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electric incandescent lamp (4), in particular an incandescent halogen p, has a bulb or envelope (5), which is shaped as an ellipsoid or optionally ellipsoidlike (barrel-shaped body) and provided with an IR layer (8). Located inside the bulb (5) axially is a compact filament (2') of circular-cylindrical outer contour; the focal lines of the ellipsoid-like barrel-shaped body each coincide approximately with the last luminous winding on the two ends of the filament. This improves lamp efficiency. The compact filament is preferably in the form of a helical coil (2'), whose power supply lead (10b) remote from the seal is returned to inside the helical coil (2'), or is shaped like a double helix.

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