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. 09, 2010
Filed:
Sep. 18, 2009
Kenjirou Mihara, Higashiomo, JP;
Atsushi Kishimoto, Kusatsu, JP;
Kenjirou Mihara, Higashiomo, JP;
Atsushi Kishimoto, Kusatsu, JP;
Murata Manufacturing Co., Ltd., Nagaokakyo-shi, Kyoto-fu, JP;
Abstract
A multilayer positive temperature coefficient thermistor includes a ceramic body having semiconductor ceramic layers and internal electrodes, the semiconductor ceramic layers being mainly composed of BaTiOand containing semiconductor-forming agents, the semiconductor ceramic layers and the internal electrodes being alternately stacked, and the outermost layers of the ceramic body being formed of the semiconductor ceramic layers. The outermost layers serve as protective layers. The semiconductor ceramic layers arranged between the internal electrodesandserve as effective layers. The protective layers contain a semiconductor-forming agent having a larger ionic radius than that of a semiconductor-forming agent contained in the effective layers. The protective layers have a lower porosity than that of the effective layers.