High intensity discharge lamps, arc tubes and methods of manufacture
US6517404B1 · kind B1 · utility
3Cited by
7References
40Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 30, 2001 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | May 30, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/395
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A tipless arc tube for a high intensity discharge lamp and method of manufacture wherein the arc tube may remain open to an uncontrolled atmosphere during the step of hermetically scaling the arc tube. The novel arc tube and method obviate the need to perform any process steps within a controlled atmosphere. The pressure of the fill gas sealed within the arc tube may be controlled by controlling the temperature of the fill gas during the step of hermetically sealing the arc tube. The novel arc tube and method obviate the need to use a pump to control the fill gas pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.