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. 06, 2003
Filed:
Nov. 29, 2000
Hirohito Ito, Konan, JP;
Kenji Nunome, Nagoya, JP;
Makoto Sugimoto, Nagoya, JP;
Kuniharu Tanaka, Komaki, JP;
Katsura Matsubara, Iwakura, JP;
Yoshihiro Yamamoto, Kasugai-gun, JP;
Masaya Ito, Nisshin, JP;
NGK Spark Plug Co., Ltd., Nagoya, JP;
Abstract
An insulator for spark plug comprises an alumina-based sintered body comprising: Al O as a main component; and at least one component (hereinafter referred to as “&bgr; component”) selected from the group consisting of Ca component, Sr component and Ba component, wherein the alumina-based sintered body comprises particles comprising a compound comprising the &bgr; component and Al component, the compound having a molar ratio of the Al component to the &bgr; component of 4.5 to 6.7 as calculated in terms of oxides thereof, and has a relative density of 90% or more.