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:
Feb. 05, 1991
Filed:
Jun. 14, 1989
Nippon Oil & Fats Co., Ltd., Tokyo, JP;
Abstract
A composition for a reduction-reoxidation type semiconductive ceramic capcitor is disclosed which consists substantially of 100 mol % of a barium composite oxide consisting of BaTiO.sub.3 and BaZrO.sub.3 and having a BaZrO.sub.3 content in the range of 0 to 20 mol %, 0.3 to 3.0 mol % of Bi.sub.2 O.sub.3, and 0.1 to 8.5 mol % of at least one member selected from the group consisting of TiO.sub.2 and ZrO.sub.2 and further incorporates therein 0.001 to 1.00% by weight of at least one member selected from the group consisting of the oxides of Cr, Fe, Co, Zn, Cu, Al, Si, and Mg. This composition possesses a breakdown voltage of not less than 400 V, an insulation resistance of not less than 10.sup.9 .OMEGA., an electrostatic capacity of not less than 0.65 .mu.F/cm.sup.2 per unit surface area, and a magnitude, tan .delta., of less than 2.5%.