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:
Feb. 19, 2013
Filed:
Feb. 19, 2009
Yutaka Sekiguchi, Ichinomiya, JP;
Yoshihito Ikai, Tsushima, JP;
Takeshi Mitsuoka, Kounan, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A ceramic heater () includes a substrate () and a resistor element () buried in the substrate (). The resistor element () includes a heat-generating portion (), lead portions (), and intermediate portions () located between the heat-generating portions () and the lead portions (). The intermediate portions () are formed such that, when cross sections at arbitrary two points Pand Palong the axis XA direction are compared, both the diameter CL of an imaginary circumscribed circle CG containing cross sections of the resistor elementand the total cross sectional area HS of the cross sections become small in the front end side cross section as compared with those in the rear end side cross section.