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:
Jan. 26, 2010
Filed:
Oct. 12, 2007
Yasushi Kawashima, Mie-ken, JP;
Yasushi Kawashima, Mie-ken, JP;
DENSO CORPORATION, Kariya, JP;
Abstract
A spark plug fitted to a cylinder head has a center electrode with a noble metallic tip portion having a sectional area Sbetween 0.07 mmand 0.95 mmand a melting point of 2000° C. or more, and a ground electrode with a noble metallic tip portion having a sectional area Sand a melting point of 1700° C. or more. The plug has a length H ranging from 6.5 mm and 10 mm between the head and the tip portion of the center electrode, a length G ranging from 1.1 mm and 2.0 mm between the tip portions, a length J between the head and a housing, a length F satisfying J≦F≦H−1.0 mm between the head and an insulator, and a pocket clearance P satisfying P≧1.1×(G+0.0345×S+0.0327×S) between the housing and the insulator.