Incandescent bulb and incandescent bulb filament

Details Incandescent bulb and incandescent bulb filament Incandescent bulb and incandescent bulb filament

2006-05-23

2006-05-23

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

Electrode and shield structures

Filament or resistance heated electrodes

C313S578000, C313S273000

Reexamination Certificate

active

07049735

ABSTRACT:
An incandescent bulb filament having a flat Light-emitting surface and high Lamp efficiency and an incandescent bulb using this filament are provided. This incandescent bulb filament is characterized in that it is a filament of ribbon shape placed on one plane, and it includes: spaced portions which are placed side by side with spaces; and connecting portions which connect the spaced portions electrically in series. Each spaced portion has a thickness that is one half the width of the spaced portion or more, and the space between at least one pair of adjacent spaced portions is less than five times the width of the spaced portion.

REFERENCES:
patent: 4144473 (1979-03-01), Almer
patent: 5343112 (1994-08-01), Wegmann et al.
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patent: 3-102701 (1991-04-01), None
patent: 4-368769 (1992-12-01), None
patent: 5-166496 (1993-07-01), None
patent: 6-349358 (1994-12-01), None
patent: 2002-015707 (2002-01-01), None

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