Discharge lamp with spiral shaped discharge tube
US6633128B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 2001 |
| Grant date | Oct 14, 2003 |
| Priority date | — |
| Expiry date | Oct 7, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/72
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A low-pressure discharge lamp with a double spiral shaped discharge tube including two spiral shaped tube portions. The tube portions define a central axis of the discharge tube. A cold chamber portion connects the ends of the spiral shaped tube portions. The cold chamber portion has a first transversal dimension substantially perpendicular to the central axis which is larger than the diameter of the tube portions. The cold chamber portion further has a second transversal dimension substantially parallel to the central axis. The second transversal dimension of the cold chamber portion substantially corresponds to the diameter of the tube portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.