Granted Patent
Utility
US 6,778,038 · App. 10/260,265
Piezoelectric resonant filter, duplexer, and method of manufacturing same
Inventors:
Taku Takeishi, Katsuhiko Gunji, Eiju Komuro
Patented Case
View Patent ↗
Granted: Aug 17, 2004
Filed: Oct 1, 2002
Inventors
Taku Takeishi
Katsuhiko Gunji
Eiju Komuro
Assignee (at issue)
TDK CORPORATION
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.