The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 2003
Filed:
Apr. 26, 2002
Applicant:
Inventors:
Assignee:
NGK Spark Plug Co., Ltd., Aichi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02P 1/300 ; H01T 1/308 ;
U.S. Cl.
CPC ...
F02P 1/300 ; H01T 1/308 ;
Abstract
A plug hole pipe has thread grooves formed on an outer circumferential surface thereof and causes a spark plug to be pressed against a cylinder head when the plug hole pipe is fixedly attached to the cylinder head through screw engagement. The spark plug is configured such that no thread grooves are formed on the outer circumferential surface of a front end portion of a metallic shell and can be vertically inserted into a plug disposition hole formed in the cylinder head By vertically inserting the spark plug into the plug disposition hole while the orientation of a ground electrode is set beforehand in relation to the cylinder head the ground electrode can be oriented in a specific direction.