Granted Patent
Utility
US 6,670,866 · App. 10/045,645
Bulk acoustic wave resonator with two piezoelectric layers as balun in filters and duplexers
Inventors:
Juha Ellä, Robert Aigner
Patented Case
View Patent ↗
Granted: Dec 30, 2003
Filed: Jan 9, 2002
Inventors
Juha Ellä
Robert Aigner
Assignee (at issue)
Nokia
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.