Spark plug

Details Spark plug Spark plug

2008-04-29

2008-04-29

Ton, Toan (Department: 2889)

Electric lamp and discharge devices

Spark plugs

Shaped electrode chamber, insulator end, shell skirt, baffle...

C313S118000, C313S141000

Reexamination Certificate

active

11114074

ABSTRACT:
A spark plug including: a external terminal; a center electrode; an insulator having a through hole as defined herein and containing alumina ceramics; and a conductive seal. The conductive seal contains base glass, a conductive filler and from 0 to 10 weight % of an insulating filler, and the base glass contains Si, B, Ca, Al, Na and K components in amounts defined herein. Also disclosed is a spark plug including a center electrode; an external terminal; a first conductive seal; a second conductive seal; a resistor provided as defined herein; and an insulator having a through hole as defined herein. The center electrode and the external terminal are bonded to the first conductive seal and the second conductive seal, respectively, in the through hole. The first and second conductive seals each contains base glass, a conductive filler and amounts of an insulating filler as defined herein.

REFERENCES:
patent: 5565730 (1996-10-01), Pollner et al.
patent: 6137211 (2000-10-01), Sugimoto et al.
patent: 6744189 (2004-06-01), Honda
patent: 2002/0024160 (2002-02-01), Sugimoto
patent: 2003/0127959 (2003-07-01), Nishikawa et al.
patent: 43 06 402 (1994-09-01), None
patent: 1 274 157 (2003-01-01), None
patent: 2003-22886 (2003-01-01), None
patent: WO 01/74728 (2001-10-01), None
patent: WO 01/74731 (2001-10-01), None

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