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US 5,517,079 AGranted
Dual filament fluorescent lamp for avoinics liquid crystal displays
AssigneeRockwell International Corporation
InventorsThomas A. Seder, Brian P. Dehmlow, David F. Beat
Life of this patent
Estimating the term…
Abstract
A dual filament fluorescent lamp where the individual filaments are disposed along diameter lines of a fluorescent tube and are disposed on differing planes at differing heights within the tube with a predetermined separation between the tube filaments and the filaments being disposed in a perpendicular fashion when viewed from above. The primary filament is disposed above the secondary filament and it has a larger diameter that the secondary filament.
Claims4
A fluorescent lamp comprising:
- a bulb having a first end and a second end;
- said first end having a first filament and a means for providing a second filament for use as a backup when said first filament fails;
- said first filament disposed along a first diameter line of the bulb in a first plane;
- said means for providing a second filament disposed in a second plane;
- and,
- wherein said first filament and said means for providing a second filament are separated by a minimum distance of one-half the diameter of bulb.
3 more elements
A fluorescent lamp comprising;
- a glass tube having a first end and a second end;
- a first end primary filament disposed in said first end of said glass tube;
- a first end secondary filament disposed in said first end of said glass tube;
- said first end primary filament disposed along a diameter line of the tube in a first end primary plane;
- said first end secondary filament disposed along a diameter line of the tube in a first end secondary plane;
- said first end primary filament and second end primary filament being separately disposed within said tube;
- and,
- said primary filament and said secondary filament are perpendicular.
5 more elements
A fluorescent lamp comprising;
- a bulb having a first end and a second end;
- said first end having a first filament and a second filament;
- said first filament disposed along a first diameter line of the bulb in a first plane;
- said second filament disposed in a second plane;
- said second filament being disposed on a second diameter line of the bulb;
- and,
- said first filament and said second filament are perpendicular.
4 more elements
Dependencies are inferred from the claim text.