Method of forming a metal halide discharge tube and apparatus therefore
US7204738B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 2004 |
| Grant date | Apr 17, 2007 |
| Priority date | — |
| Expiry date | Jan 21, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/302
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of forming a metal halide discharge tube comprises: arranging a tubular body (110) in an essentially vertical orientation; disposing a loose-fit T-plug (100) having a cylindrical portion (106) and an annular flange (104) in an upper open end of the tubular body (110) so that the cylindrical portion (106) of the T-plug (100) is disposed within the open end of the tubular body (110) in a contact-free, spaced relationship with an inner wall of the tubular body and with the annular flange (104) seating against an annular top end edge surface (108) of the tubular body (100); and firing the tubular body and the loose-fit T-plug to shrink fit the tubular body and the loose-fit T-plug to interfuse the loose-fit T-plug with the upper end of the tubular body in a manner which results in a unitary/monolithic body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.