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:
Jul. 01, 1980
Filed:
Oct. 02, 1975
Applicant:
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B / ; C04B / ;
U.S. Cl.
CPC ...
252 629 ;
Abstract
Piezoelectric ceramic compositions having low dissipation factor, high mechanical quality factor, certain specified electromechanical coupling coefficients and high time stability of resonant resistance, and comprising the ternary system Pb(Sn.sub.1/3 Sb.sub.2/3)O.sub.3 -PbTiO.sub.3 -PbZrO.sub.3 and containing at least one oxide selected from the group consisting of MnO.sub.2, CoO, Cr.sub.2 O.sub.3, Fe.sub.2 O.sub.3 and NiO in a total quantity equivalent to from 0.1 to 5 weight percent.