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:
Sep. 28, 1999
Filed:
Jun. 26, 1998
Applicant:
Inventors:
Koichi Kawano, Shiga-ken, JP;
Kazuya Kamada, Kusatsu, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B / ; H01L / ;
U.S. Cl.
CPC ...
252 / ; 252 / ; 310311 ; 310364 ; 310366 ; 501103 ; 501104 ; 501134 ; 501135 ; 501136 ; 501137 ; 501138 ; 501139 ;
Abstract
Disclosed is a sintered piezoelectric ceramic which is resistant to the high voltage for polarization with no dielectric breakdown and has good moisture resistance. When a plurality of the ceramics are fired, they are prevented from being fused and combined together. The production costs of the ceramic are low. The sintered piezoelectric ceramic comprises particulate or agglomerate zirconia grains dispersed in piezoelectric ceramic grains, in which the mean grain size of the piezoelectric ceramic grains is smaller than that of the zirconia grains.