Method for manufacturing a discharge lamp envelope having multiple constrictions
US4582523A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1984 |
| Grant date | Apr 15, 1986 |
| Priority date | — |
| Expiry date | Dec 6, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/33
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for manufacturing a fluorescent lamp envelope of substantially round configuration in cross-section and having a plurality of constricting portions axially spaced apart and extending substantially about the circular periphery of the envelope and projecting therein. The method comprises the steps of providing an envelope having a predetermined length and axially opposed end portions, providing a plurality of heat sources, providing relative rotation between the envelope and the plurality of heat sources, providing a means for engaging the envelope and for forming the plurality of constricting portions, moving the forming means to engage the envelope and applying a positive pressure within the envelope while the forming means is engaged with the envelope.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.