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:
Apr. 24, 2018
Filed:
Feb. 10, 2016
Denso Corporation, Kariya, Aichi-pref., JP;
Kenji Hattori, Kariya, JP;
Masamichi Shibata, Kariya, JP;
Toshiya Nakamura, Kariya, JP;
Yasuomi Imanaka, Kariya, JP;
Hirofumi Suzuki, Kariya, JP;
Hiroshi Araki, Kariya, JP;
Tomoyuki Watanabe, Kariya, JP;
Shin Hase, Kariya, JP;
DENSO CORPORATION, Kariya, JP;
Abstract
A spark plugincludes a cylindrical housing, a cylindrical insulator, a center electrode, a terminal bracket, a ground electrode, and a resistor. The insulator is held on the inside of the housing. The center electrodeis held on the inside of the insulator, with a tip end being projected therefrom. The terminal bracket is held on the inside of the insulator, with a base end part and being projected therefrom. The ground electrode forms a spark discharge gap G between itself and the center electrode. The resistor contains carbon and is disposed on the inside of the insulator so as to be located between the center electrodeand the terminal bracket. In an axial direction X of the spark plug, the resistor has a higher carbon content in a first region positioned on a tip side, compared to a second region positioned on a base end side.