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:
Jan. 10, 2012
Filed:
Mar. 23, 2009
Tsutomu Shibata, Owariasahi, JP;
Ryoji Kato, Inuyama, JP;
Atsushi Tsukada, Yokkaichi, JP;
NGK Spark Plug Co., Ltd., , JP;
Abstract
A decrease in yield and degradation of productivity can be avoided when a spark plug having an insulator with low mechanical strength is manufactured. In a second process, a terminal electrodeis inserted to a predetermined position in a state where an insulatoris heated to a temperature equal to or greater than the softening temperatures of first to third powder materialsP,P, andP such that the first powder materialP becomes a first conductive sealing material layer, the second powder materialP becomes a resistor, and the third powder materialP becomes a second conductive sealing material layer. In addition, a speed at which the terminal electrodeis inserted is reduced between the start and the end of the second process.