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:
Jun. 22, 2004
Filed:
May. 22, 2002
Applicant:
Inventors:
Assignee:
Murata Manufacturing Co., Ltd., Kyoto-fu, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01L 4/1187 ;
U.S. Cl.
CPC ...
H01L 4/1187 ;
Abstract
In a piezoelectric ceramic containing a bismuth layer compound containing Ca, Bi, Ti, and O, as a main component, the molar ratio of Ca to Bi to Ti in the bismuth layer compound, which is the main component, is represented by a:b:c and formulas 0.15≦a/c<0.25 and 3.5≦(2a+3b)/c≦3.88 are satisfied.