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:
Sep. 25, 2018
Filed:
Apr. 18, 2012
Kazuya Matsui, Nagoya, JP;
Shindo Watanabe, Kitanagoya, JP;
Kazuya Matsui, Nagoya, JP;
Shindo Watanabe, Kitanagoya, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
A ceramic heater including a columnar substrate and a heat generation resistor embedded in the substrate. A taper surface () having a contour Lextending along an imaginary ellipse E is composed of a plurality of successively arranged curved surfaces which decrease in radius of curvature toward the forward end with respect to the direction of an axis P. The taper surface () is such that the distance between the end points Mand Mof the contour Lis large in the direction of the axis P, and the angle between the axis P and a tangential line of the contour Lon the side toward the forward end surface () is larger than the angle between the axis P and a tangential line of the contour Lon the side toward the side circumferential surface ().