Electric lamp with a holding frame for a lamp filament
US5367220A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1992 |
| Grant date | Nov 22, 1994 |
| Priority date | — |
| Expiry date | May 22, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01K1/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
To permit ready insertion of a holding frame for a filament into an essentially tubular bulb, particularly a halogen incandescent lamp bulb made of quartz glass or hard glass, the frame has two legs extending along the wall of the bulb, connected by a holding portion to hold the filament at the end remote from the current supply leads to the filament, one of the legs of the frame is shorter than the other, for example only about one-third the length of the bulb. The longer leg of the frame can be pinch-sealed in a pinch seal closing off the bulb. The holding portion, which is intermediate the two legs, is preferably U-shaped to form a hook into which the filament can be hooked; or, particularly if the legs of the U are close together, about which the filament can be wound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.