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:
Apr. 18, 2000
Filed:
Dec. 03, 1998
Applicant:
Inventors:
Satoshi Sasaki, Akita, JP;
Masaru Nanao, Chiba, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C04B / ; C04B / ;
U.S. Cl.
CPC ...
252 / ; 501134 ;
Abstract
A piezoelectric ceramic composition which contains a main component represented by the general formula of x(Pb.sub.2 Me.sub.2 O.sub.7).sub.1/2 .multidot.(1-x)[Pb(Zr.sub.1-y Ti.sub.y)O.sub.3 ] in which x and y are numerical values satisfying the relations 0.01.ltoreq.x.ltoreq.0.05 and 0.40.ltoreq.y.ltoreq.0.55, and Me is at least one of Sb, Nb and Ta. In the component, 0.1 to 0.8% by weight of Cr calculated in terms of chrome oxide and 0.01 to 0.1% by weight of Si calculated in terms of silicon oxide with respect to the weight of 1 mol of the main component are added as subsidiary components.