Patent · US Expired

Electric lamp with opaque cap, particularly halogen cycle, dual filament, automotive-type lamp

US4305016A · kind A · utility

9Cited by

1References

3Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventor

Gerhard Schmidt · Graz, AT

Key dates

Filing date	Aug 3, 1979
Grant date	Dec 8, 1981
Priority date	—
Expiry date	Aug 3, 1999

Classification

Technology area (CPC H)Electricity
CPC primaryH01K1/32
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electric lamp, particularly a halogen cycle lamp, adapted to be used as dual filament automotive lamp which has an opaque end cap coated on the hard glass bulb. The end cap coating comprises a mixture of carbonyl iron powder and silicon powder, preferably in a ratio of between 1.5:1 and 4:1 (by weight) and more preferably in a ratio of about 2:1. The lamps have the important advantages of excellent utility during service coupled with the ability to be manufactured at relatively low burning in temperatures, i.e. in the order of about 530.degree. C.

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