Patent · US Expired

Method for producing helically wound filament elements, and filament elements produced according to this method

US6161598A · kind A · utility

4Cited by

6References

21Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Juergen Eder · Cologne, DE
Hans Liermann · Kandern, DE
Peter Schmidt · Schwieberdingen, DE
Reinhard Sprenger · Wipperfürth, DE

Key dates

Filing date	Mar 31, 1998
Grant date	Dec 19, 2000
Priority date	—
Expiry date	Mar 31, 2018

Classification

Technology area (CPC H)Electricity
CPC primaryH01K3/02
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method for producing helically wound filament elements, and filament elnts produced according to this method. The method is distinguished in that a thermal treatment of the incandescent wire at temperatures of over 1200.degree. C. takes place already before the winding of the incandescent wire, so that, after separation, the coil springs open and can easily be detached from the core wire.

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