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. 20, 1990
Filed:
Feb. 22, 1989
NGK Spark Plug Co., Ltd., Nagoya, JP;
Abstract
A spark plug with pressure sensor comprising; a center electrode; an insulator placed to enclose the center electrode to support the electrode; a metallic shell having a diameter-increased portion, a diameter-reduced portion and a male thread portion in turn, the male thread portion being diametrically smaller than the diameter-reduced portion; an annular-shaped pressure sensor inserted into an outer surface of the diameter-reduced portion; an annular flange inserted into the outer surface of the diameter-reduced portion to sandwich the pressure sensor with an overhang portion of the diameter-increased portion; a gasket ring being placed underside of the flange when the metallic shell is screwed through the thread portion to a cylinder block of an engine; the annular flange extending its inner rim to position at a central side of the pressure sensor, and welded to the metallic shell.