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. 27, 2005
Filed:
Mar. 16, 2004
Koji Okazaki, Aichi, JP;
Mitsuru Kondo, Aichi, JP;
Tomohiro Fuma, Aichi, JP;
Takahiro Suzuki, Aichi, JP;
Koji Okazaki, Aichi, JP;
Mitsuru Kondo, Aichi, JP;
Tomohiro Fuma, Aichi, JP;
Takahiro Suzuki, Aichi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A glow plug includes a cylindrical housing having an inward protrusion extending radially inwardly, a threaded portion for screwing the glow plug in an engine plug hole and a sealing portion in a front side of the male threaded portion for airtightly engaging the housing with a given portion of the plug hole, a sheath having a rear sheath end portion airtightly fixed in the housing, a heater disposed in the sheath, a center electrode disposed in the housing and having a front electrode end portion electronically connected with the heater and mechanically connected with the sheath and an outward protrusion protruding radially outwardly, and a combustion pressure sensor having a pressure-sensitive element arranged between a front surface of the inward protrusion and a rear surface of the outward protrusion to generate an electrical signal in response to variations in stress applied thereto.