Apparatus for manufacturing a discharge lamp envelope having multiple constrictions
US4585468A · kind A · utility
3Cited by
7References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1984 |
| Grant date | Apr 29, 1986 |
| Priority date | — |
| Expiry date | Dec 6, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B23/055
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for manufacturing a fluorescent lamp envelope comprises means for holding the envelope, a plurality of heat sources, means for providing relative rotation between the envelope and the plurality of heat sources with the heat therefrom acting on substantially narrow axially spaced regions on the envelope, means for engaging the envelope and for forming a plurality of constricting portions at axially spaced regions on the envelope, means for moving the forming means to engage the envelope and means for 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.