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. 06, 1996
Filed:
Dec. 23, 1994
Hiroshi Katagiri, Aichi, JP;
Hirofumi Ozeki, Aichi, JP;
NGK Spark Plug Co., Ltd., , JP;
Abstract
The present invention provides a microwave dielectric ceramic composition in which .epsilon.r, Qu and .tau.f are generally controlled within a practical characteristic range and each of the characteristics is maintained in a well balanced state. A ceramic composition of the present invention comprises a composition represented by xBi.sub.2 O.sub.3 -(1-x) (yNb.sub.2 O.sub.5 -(1-y)Ta.sub.2 O.sub.5) in which 0.45.ltoreq.x.ltoreq.0.55 and 0.1.ltoreq.y<1.0 as a main ingredient, to which not more than 0.8 parts by weight of V.sub.2 O.sub.5 is added and incorporated. An another ceramic composition comprises a composition represented by Bi(NbxTa1-x)O.sub.4 in which 0<x.ltoreq.0.96 as a main ingredient, to which not more than 5 wt % of V.sub.2 O.sub.5 and not more than 2 wt % of PbO are added and incorporated. An another ceramic composition comprises the main ingredient as described above to which not more than 5 wt % of V.sub.2 O.sub.5 and not more than 2 wt % of MnO.sub.2 are added and incorporated. An another ceramic composition comprises the main ingredient as described above to which not more than 2 wt % of V.sub.2 O.sub.5 and not more than 1 wt % of TiO.sub.2 are added and incorporated. An another ceramic composition comprises the main ingredient as described above, to which not more than 2 wt % of V.sub.2 O.sub.5, not more than 2 wt % of MnO.sub.2 and not more than 0.7 wt % of TiO.sub.2 are added and incorporated. Instead of TiO.sub.2 described above, not more than 0.5 wt % (particularly not more than 0.4 wt %) of PbO can be added and incorporated.