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. 02, 1996
Filed:
May. 01, 1995
Takahiro Suzuki, Nagoya, JP;
Kouji Okazaki, Nagoya, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A spark plug is provided with a built-in, ring-shaped pressure sensor. The pressure sensor is composed of a plate packing, a piezoelectric element, an electrode plate and an insulating plate stacked one over the other and also includes a lead wire extending from the electrode plate through a through-hole formed in an upper part of a base portion of a metal shell to output electrical signals. The pressure sensor is accommodated in a cylindrical metal casing of L-shaped cross-section and disposed above a gasket and on the base portion. The metal casing is integrally welded over an entire circumference thereof to the base portion at an upper edge and also at a lower edge, whereby the pressure sensor is sealed within the metal casing.