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. 16, 2018
Filed:
Apr. 09, 2015
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Masato Yamazaki, Komaki, JP;
Takayuki Matsuoka, Aichi, JP;
Yoshiteru Honda, Ise, JP;
Kazuaki Kitamura, Ise, JP;
Hisashi Kozuka, Ichinomiya, JP;
Toshiaki Kurahashi, Konan, JP;
Yasuyuki Okimura, Inuyama, JP;
Hideto Yamada, Komaki, JP;
Kazushige Ohbayashi, Nagoya, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
A lead-free piezo-electric porcelain composition which contains a main phase having voids and which is formed of a first crystal phase composed of an alkali niobate/tantalate-based perovskite oxide having piezo-electric characteristics; and a sub-phase containing a second crystal phase composed of an ABO-based compound (where the element A is a monovalent element and the element B is one or more divalent to hexavalent elements). The sub-phase fills voids present in the main phase.