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. 27, 1991
Filed:
Apr. 23, 1990
Koichi Kumagai, Ikoma, JP;
Shinji Shimazaki, Yawata, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
A multilayer ceramic substrate comprises plural conductive layers and insulation layer for insulating the plural conductive layers, and the insulation layer is made of an inorganic composition comprising at least one member selected from the group of Al.sub.2 O.sub.3 and ZrO.sub.2, SiO.sub.2, PbO, and at least one member selected from the group of BaO, CaO and ZnO in predetermined range. The multilayer ceramic substrate can be sintered at low temperature in the air and is splendid in a heat resistance, a solderability and resistance value of the insulation layer and furthermore, a microcrack is not caused in a laser trimming of a top resistance film.