Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2007-09-13
2010-11-30
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S189000, C333S190000
Reexamination Certificate
active
07843285
ABSTRACT:
A piezoelectric thin-film filter includes a first electrode pair having two or more first electrode fingers disposed on one main surface of a piezoelectric thin film and second electrode fingers disposed on the other main surface of the piezoelectric thin film so as to face the first electrode fingers. A second electrode pair includes two or more third electrode fingers disposed on the main surface such that the third electrode fingers and the first electrode fingers are disposed alternately with gaps therebetween and fourth electrode fingers disposed on the other main surface so as to face the third electrode fingers with the piezoelectric thin film therebetween. Insulating films are provided between the first and third electrode fingers. Each of the center-to-center distances Wa+Wm and Wf+Wm between the first and third electrode fingers that are disposed alternately is larger than a value twice the thickness T of the piezoelectric thin film.
REFERENCES:
patent: 2271870 (1942-02-01), Mason
patent: 6342753 (2002-01-01), Oliver et al.
patent: 6349454 (2002-02-01), Manfra et al.
patent: 6734600 (2004-05-01), Aigner et al.
patent: 6963155 (2005-11-01), Wadaka et al.
patent: 2002/0043888 (2002-04-01), Aigner et al.
patent: 2006/0091978 (2006-05-01), Wang et al.
patent: 2006/0284703 (2006-12-01), Iwasaki et al.
patent: 0 952 618 (1999-10-01), None
patent: 04-018806 (1992-01-01), None
patent: 2001-094373 (2001-04-01), None
patent: 2002-368576 (2002-12-01), None
patent: 2002-541704 (2002-12-01), None
patent: 2003-347889 (2003-12-01), None
patent: 3535101 (2004-06-01), None
US 7,212,084, 05/2007, Takeuchi et al. (withdrawn)
Official communication issued in counterpart European Application No. 06731095.3, mailed on Jun. 9, 2008.
Official communication issued in the International Application No. PCT/JP2006/307147, mailed Jul. 18, 2006.
Official Communication issued in corresponding Japanese Patent Application No. 2007-521173, mailed Jan. 19, 2010.
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
Pascal Robert
Wong Alan
LandOfFree
Piezoelectric thin-film filter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Piezoelectric thin-film filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Piezoelectric thin-film filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4199717