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. 27, 2004
Filed:
Apr. 29, 2002
Applicant:
Inventors:
Assignee:
NGK Spark Plug Co., Ltd., Aichi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F23Q 7/00 ;
U.S. Cl.
CPC ...
F23Q 7/00 ;
Abstract
A ceramic heater is arranged in a metallic cylinder member by forming a convergent taper portion at the leading end of the ceramic heater and by positioning the leading end of the metallic cylinder member on the leading end side of a taper starting point P of the taper portion . Solder is applied in the clearance between the inner circumference of the metallic cylinder member and the outer circumference of the heater An applied solder layer is also formed on the leading end side of the taper starting point P of the taper portion . The thick solder layer present on the leading end side prevents a cut or broken off portion of the ceramic heater from separating or sliding out.