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:
May. 05, 2020
Filed:
Jul. 14, 2017
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Muneyuki Iwata, Kasugai, JP;
Yoshiaki Nagaya, Komaki, JP;
Toshikazu Horio, Kasugai, JP;
Shigeyuki Yamamoto, Kitanagoya, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
A ceramic-metal structure in which a metallic body () is inserted into or disposed above a through hole () of a ceramic substrate () and which includes an annular pad layer () disposed around the through hole; an annular ring member () joined to the pad layer via a first brazing filler portion () and having a coefficient of thermal expansion smaller than that of the metallic body; a second brazing filler portion () intervening between the ring member and metallic body; and brazing filler flow prevention layers () covering an outer surface of the pad layer so as to expose a central region () of the outer surface of the pad layer facing the first brazing filler portion. The first brazing filler portion joins the central region and the ring member without projecting to a radially inner or outer side of the flow prevention layers.