Plasma jet spark plug and manufacturing method therefor

Details Plasma jet spark plug and manufacturing method therefor Plasma jet spark plug and manufacturing method therefor

2008-03-28

2010-11-23

Patel, Nimeshkumar D (Department: 2879)

Electric lamp and discharge devices

Spark plugs

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

C445S007000, C313S144000

Reexamination Certificate

active

07839065

ABSTRACT:
A plasma jet spark plug and a manufacturing method therefor are disclosed. In a state in which a noble-metal chip having a flange-like outwardly projecting portion is disposed in a communication section of a ground electrode, an electrode base metal of the ground electrode is disposed in a stepped engagement portion of a metallic shell, which retains an insulator therein. While being pressed against a front end portion of the insulator, the noble-metal chip is joined to the electrode base metal, whereby a clearance between the ground electrode (electrode base metal) and the front end portion of the insulator can be closed. Therefore, energy of plasma generated within the cavity does not leak.

REFERENCES:
patent: 2006/0137642 (2006-06-01), Artmann et al.
patent: 57-15379 (1982-01-01), None
patent: 1-274374 (1989-11-01), None
patent: 2072577 (1990-03-01), None
patent: 2006294257 (2006-10-01), None
Office Action from corresponding Japanese Patent Application No. 2008-030584, issued on May 12, 2009 (with English translation); 4 pages.
Attachment—Concise Explanation of Relevance of Non-English Language Documents.
Office Action from corresponding Chinese Patent Application No. 2008-10084898X, issued on Jun. 12, 2010 (with English translation); 9 pages.
Attachment—Concise Explanation of Relevance of Non-English Language Documents.

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