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. 02, 2002
Filed:
Jun. 22, 2001
NGK Spark Plug Co., Ltd., Nagoya, JP;
Abstract
A spark plug comprises: a center electrode ( ); an insulator ( ) provided around the center electrode ( ); a metal shell ( ) provided around the insulator ( ); a ground electrode ( ) disposed in opposition to the center electrode ( ) so as to form a spark discharge gap; and a sealing-material layer ( ) comprising a sealing material, wherein the sealing material comprises talc, and the sealing material is filled in a space between the inner face of the metal shell ( ) and the outer face of the insulator ( ), so as to seal the space, wherein the sealing material has a filling density of 1.5 g/cm to 3.0 g/cm , or the sealing-material layer ( ) comprises at least one of an inorganic material and a silicone binder in an amount of 2 to 7 wt %.