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:
Nov. 02, 2010
Filed:
Aug. 11, 2005
Takeshi Shimada, Osaka, JP;
Kei Matsumoto, Osaka, JP;
Koichi Terao, Osaka, JP;
Kazuya Toji, Osaka, JP;
Kazuhiro Nishikawa, Osaka, JP;
Takeshi Shimada, Osaka, JP;
Kei Matsumoto, Osaka, JP;
Koichi Terao, Osaka, JP;
Kazuya Toji, Osaka, JP;
Kazuhiro Nishikawa, Osaka, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
The invention intends to provide, in BaTiOsemiconductor porcelain composition, a semiconductor porcelain composition that, without using Pb, can shift the Curie temperature to a positive direction and can significantly reduce the resistivity at room temperature. According to the invention, when Ba is partially substituted by an A1 element (at least one kind of Na, K and Li) and an A2 element (Bi) and Ba is further substituted by a specific amount of a Q element, or when Ba is partially substituted by an A1 element (at least one kind of Na, K and Li) and an A2 element (Bi) and Ti is partially substituted by a specific amount of an M element, the optimal valence control can be applied and whereby the resistivity at room temperature can be significantly reduced. Accordingly, it is optimal for applications in a PTC thermistor, a PTC heater, a PTC switch, a temperature detector and the like, and particularly preferably in an automobile heater.