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. 28, 1987
Filed:
Dec. 18, 1984
Hiroshi Miyata, Aichi, JP;
Shogo Kawajiri, Aichi, JP;
NGK Spark Plug Co., Ltd., , JP;
Abstract
A piezoelectric pick-up device for an internal combustion engine is disclosed, which comprises a metal case mounted on an internal combustion engine cylinder wall or the like, a mounting metal rod projecting from the inner bottom surface of the metal case into the interior thereof, a piezoelectric element and a weight disposed in the case interior and fitted on the mounting rod, the piezoelectric element being electrically coupled to the metal case, a cap-like cover fittedly covering the weight or the entirety of the piezoelectric element and the weight, and a molding material filling the case interior. The cap-like cover is made of an elastic material or a hard material.