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:
Dec. 29, 2009
Filed:
Jun. 14, 2007
Takehiko Yamakawa, Osaka, JP;
Tomohide Kamiyama, Osaka, JP;
Tomohiro Iwasaki, Osaka, JP;
Hiroshi Nakatsuka, Osaka, JP;
Keiji Onishi, Osaka, JP;
Takehiko Yamakawa, Osaka, JP;
Tomohide Kamiyama, Osaka, JP;
Tomohiro Iwasaki, Osaka, JP;
Hiroshi Nakatsuka, Osaka, JP;
Keiji Onishi, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A piezoelectric filter comprises a substrate and a plurality of piezoelectric resonators provided on the same substrate. Each piezoelectric resonator comprises a cavity formed in the substrate, a lower electrode formed on the substrate, covering the cavity, a piezoelectric material layer formed on the lower electrode, and an upper electrode formed on the piezoelectric material layer. At least one of the piezoelectric resonators has a cavity formed of a plurality of cells.