Patent · US Expired

Dual-filament halogen incandescent lamp, particularly sealed-beam, automotive headlight

US4302698A · kind A · utility

6Cited by

5References

8Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Rolf Kiesel · Aalen, DE
Manfred Gaugel · Fürstenfeldbruck, DE

Key dates

Filing date	Sep 17, 1979
Grant date	Nov 24, 1981
Priority date	—
Expiry date	Sep 17, 1999

Classification

Technology area (CPC H)Electricity
CPC primaryH01K1/18
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The lamp bulb (1) has two filaments (4, 5) positioned within the bulb and rallel to the longitudinal axis (L) thereof, for example located at an axis of symmetry passing through the longitudinal axis, or in two respective planes of symmetry (E4, E5) which are, respectively, parallel to the axis of symmetry (S) of the lamp, the two filaments being preferably symmetrically positioned with respect to the axis of symmetry of the lamp (L). When located in a sealed-beam headlight, one of the filaments forms a depressed beam and the other the high beam, the high beam being preferably positioned along the axis of the reflector, at or close to the focal point thereof, for example by an off-center positioning of the bulb within the reflector.

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