Coil filament

Details Coil filament Coil filament

2006-01-10

2006-01-10

Santiago, Mariceli (Department: 2879)

Electric lamp and discharge devices

Electrode and shield structures

Filament or resistance heated electrodes

C313S628000, C313S631000

Reexamination Certificate

active

06984928

ABSTRACT:
A coiled filament has a light emitter with a reduced volume as best possible to serve in downsizing a light bulb and elevate an illumination with high efficiency in an illuminated field. A flat coiled filament wound into flatness is arranged in the form of a helix or ring, locating the longer axis of the flatness in parallel with the central axis of the coiled filament or to cross the central axis at an appropriate angle. Alternatively, it is arranged in coincident with the radial axis of the coiled filament or at an appropriate angle. Alternatively, the flat coiled filament is U-shaped and a pair of such U-shaped flat coiled filaments are mated with each other through their open ends, while the inner surfaces of their closed ends are kept in non-contact with each other. Alternatively, the flat coiled filament is formed circular.

REFERENCES:
patent: 2167765 (1939-08-01), McGowan
patent: 2731581 (1956-01-01), Krefft
patent: 3400294 (1968-09-01), Kling
patent: 4506187 (1985-03-01), Hofmann et al.
patent: 4611146 (1986-09-01), Morrison
patent: 4745325 (1988-05-01), Koizumi
patent: 5143447 (1992-09-01), Bertenshaw
patent: 5729082 (1998-03-01), Snijkers
patent: 2324907 (1998-11-01), None
patent: 621360 (1987-01-01), None
patent: 03217272 (1993-03-01), None
patent: 05135750 (1993-06-01), None
patent: WO 93/01613 (1993-01-01), None
patent: WO9927297 (1999-06-01), None
patent: WO0052737 (2000-09-01), None
International Search Report dated Mar. 5, 2002.

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