Electric lamp and discharge devices – Spark plugs
Reexamination Certificate
2011-03-15
2011-03-15
Patel, Nimeshkumar D (Department: 2879)
Electric lamp and discharge devices
Spark plugs
Reexamination Certificate
active
07906893
ABSTRACT:
There is provided a spark plug of an internal combustion engine, including a cylindrical metal shell, an insulator retained in the metal shell and having a through hole in an axial direction of the spark plug and a center electrode fitted in the through hole of the insulator. The insulator includes a rear body portion, a middle body portion and a large-diameter portion located between and protruded radially outwardly from the rear and middle body portions to define a rear shoulder section connected to the rear body portion and a front shoulder section connected to the middle body portion. For strength improvements, the insulator has a first glaze layer extending over the rear body portion and the rear shoulder section of the large-diameter portion and a second glaze layer extending over at least part of the middle body portion from some point on the front shoulder section of the large-diameter portion.
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“Road vehicles—M12 × 1,25 spark-plugs with flat seating and 14 mm bi-hexagon and their cylinder head housing”; International Standard; ISO 22977:2005(E); First edition Jul. 15, 2005.
Honda Toshitaka
Moribe Mai
Suzuki Akira
Horikoshi Steven
NGK Spark Plug Co. Ltd.
Patel Nimeshkumar D
Sughrue & Mion, PLLC
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