Lamp filament
US7541726B2 · kind B2 · utility
4Cited by
8References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 17, 2006 |
| Grant date | Jun 2, 2009 |
| Priority date | — |
| Expiry date | Aug 18, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01K1/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A base-up incandescent lamp (10) includes a coiled-coil filament (14) that has a primary wire (18) and a secondary wire (16), the primary wire (18) comprising an overwind that overlies the secondary wire (16) and provides a lower filament temperature and, therefore, less filament sag and a concomitant longer lamp life.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.