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:
Aug. 20, 2002
Filed:
Nov. 29, 2000
Yukihito Yamashita, Eniwa, JP;
Akira Omi, Sapporo, JP;
Takeshi Iino, Chitose, JP;
Shigeki Inagaki, Eniwa, JP;
Tatsuro Kikuchi, Ikoma, JP;
Yoshinori Tomita, Eniwa, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A method for screening multi-layered ceramic capacitors having internal defects at a high accuracy by superposing a direct-current constant current between external electrodes of a multi-layered ceramic capacitor having a defective part in an effective layer of the dielectric ceramic, raising the voltage between the external electrodes, and further feeding the direct-current constant current for a specific time after the voltage curve becomes flat, capacitors experiencing a sudden drop in the voltage between the external electrodes during the feeding time are sorted out and removed as a defective product.