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:
Oct. 15, 1996
Filed:
May. 19, 1994
Applicant:
Inventors:
Mutsuko Nakano, Chiba, JP;
Makoto Kobayashi, Chiba, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C04B / ;
U.S. Cl.
CPC ...
501135 ;
Abstract
A dielectric ceramic material containing lead, calcium, tungsten, iron, and niobium in oxide form has a primary phase of the composition: (pb.sub.1-z Ca.sub.z)(W.sub.s Fe.sub.t Nb.sub.u)O.sub.3 wherein 0.3.ltoreq.z.ltoreq.0.9, s+t+u=1, 0.01.ltoreq.s.ltoreq.0.2, 0.5.ltoreq.t.ltoreq.0.6, and 0.2.ltoreq.u.ltoreq.0.49. The material which can be effectively fired at low temperature has a minimal temperature coefficient of resonance frequency in the microwave frequencies, a high dielectric constant, and a high Q.multidot.f value.