Spark plug with powder filling

Details Spark plug with powder filling Spark plug with powder filling

2005-12-13

2005-12-13

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Capillary groove or space

C313S118000, C313S143000

Reexamination Certificate

active

06975062

ABSTRACT:
In a spark plug for an internal combustion engine, an insulator is vided at its inside with a center electrode. A tubular housing is disposed to surround an outer periphery of the insulator. An annular space portion is provided between the housing and the outer periphery of the insulator. A powder filling is filled in the annular space portion so as to be formed as a filled portion therein. The powder filling is composed of a plurality of filling grains. 80 weight percent and over of the filling grains, before the powder filling is filled in the annular space, have a range from 100 to 1000 μm in grain diameter, respectively.

REFERENCES:
patent: 5508582 (1996-04-01), Sugimoto et al.
patent: 6130498 (2000-10-01), Shimizu et al.
patent: 6265816 (2001-07-01), Ito et al.
patent: 6366008 (2002-04-01), Fukushima et al.
patent: 1168544 (2002-01-01), None
patent: 64-2384 (1989-01-01), None
patent: 64-8439 (1989-02-01), None
patent: 11-242982 (1999-09-01), None
patent: 2002-83664 (2002-03-01), None

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