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:
Sep. 26, 1995
Filed:
Dec. 24, 1992
Yoon H Kim, Seoul, KR;
Byeong C Lee, Seoul, KR;
Seung K Kim, Kyungki, KR;
Tae S Oh, Seoul, KR;
Nam Kim, Seoul, KR;
Korea Institute of Science and Technology, Seoul, KR;
Abstract
A composition for an intergranular insulation type semiconductive ceramic capacitor essentially consisting of 1 mole of SrTiO.sub.3, 0.005 mole to 0.012 mole of TiO.sub.2, and 0.003 mole to 0.006 mole of a quinquevalent ion oxide selected from a group consisting of Nb.sub.2 O.sub.5, Ta.sub.2 O.sub.5, Sb.sub.2 O.sub.5 and the mixture thereof. An intergranular insulation type semiconductive ceramic capacitor is made by sintering a ceramic body made of the composition at a temperature of not less than 1,500.degree. C. in the atmosphere, to form a sintered body having a liquid phase at its grain boundaries, and cooling the sintered body so that the liquid phase forms an intergranular insulating layer. The intergranular insulation type semiconductive ceramic capacitor exhibits a dielectric constant of not less than 40,000 and an insulation resistance of not less than 10.sup.9 .OMEGA..