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:
Jun. 28, 2005
Filed:
Oct. 27, 2003
Hideaki Niimi, Hikone, JP;
Hideaki Niimi, Hikone, JP;
Abstract
A laminated type semiconductor ceramic element is provided with good PTC characteristics, low room temperature resistance value and improved withstand voltage of 15V or higher. Semiconductor ceramic layers made from a semiconductor ceramic containing barium titanate as the main component and the element nickel at about 0.2 mol % or less (excluding 0 mol %), and internal electrode layers are superimposed alternately, and an external electrode is formed so as to be connected electrically with the internal electrode layers. The production method comprises the steps of obtaining a laminated product of semiconductor material layers containing a barium titanate as the main component and about 0.2 mol % or less (excluding 0 mol %) of the element nickel, and internal electrode layers, obtaining a laminated sintered compact by reduction baking of the laminated product, forming an external electrode electrically connected with the internal electrodes of the laminated sintered compact, and re-oxidization processing.