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:
Mar. 06, 2007
Filed:
Aug. 04, 2005
Tatsunori Yamada, Seto, JP;
Yuichi Yamada, Kagamihara, JP;
Koji Okazaki, Ichinomiya, JP;
Masayoshi Matsui, Ichinomiya, JP;
Keiji Ozeki, Nagoya, JP;
Takahiro Suzuki, Nagoya, JP;
Tatsunori Yamada, Seto, JP;
Yuichi Yamada, Kagamihara, JP;
Koji Okazaki, Ichinomiya, JP;
Masayoshi Matsui, Ichinomiya, JP;
Keiji Ozeki, Nagoya, JP;
Takahiro Suzuki, Nagoya, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A glow plug comprising: a cylindrical housing; a heater member as defined herein; a conductive center pole as defined herein; a first piezoelectric element as defined herein; and a second piezoelectric element as defined herein, wherein each of said first piezoelectric element and said second piezoelectric element is subjected to a preload for compressing it in said axial direction and is arranged such that, when said center pole is displaced to a root-end side, a load to be applied to one of said first piezoelectric element and said second piezoelectric element for compressing the same in said axial direction increases whereas a load to be applied to the other for compressing the same in said axial direction decreases.