Method of tipping refractory metal tubulation
US4117299A · kind A · utility
1Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 17, 1977 |
| Grant date | Sep 26, 1978 |
| Priority date | — |
| Expiry date | Feb 17, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved method for sealing off the refractory metal exhaust tubulation of the ceramic arc tube employed in the high pressure sodium discharge lamp. The method involves a single four-directional crimp of the tubulation to form an X-shaped cross-section and the subsequent electrical resistance tip-off of the tubulation while it is disposed in an inert gas atmosphere at a pressure which is higher than the pressure of the rare gas atmosphere within the arc tube and tubulation and is also above atmospheric to insure all oxygen is flushed from the area of the melting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.