Filament structure and method of making such structure
US4973878A · kind A · utility
0Cited by
7References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1989 |
| Grant date | Nov 27, 1990 |
| Priority date | — |
| Expiry date | Jul 24, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01K3/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of making an axial filament structure for a lamp in which the filament is concentric with the axis of the envelope, wherein a hook-like shape (131) is formed in a support member (117) which stretches the filament to its final turns-per-inch ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.