Granted Patent
Utility
US 6,424,239 · App. 09/580,218
Differential surface acoustic wave filter
Inventors:
Hisanori Ehara, Kazushige Noguchi, Yoshikazu KIHARA
Patented Case
View Patent ↗
Granted: Jul 23, 2002
Filed: May 26, 2000
Inventors
Hisanori Ehara
Kazushige Noguchi
Yoshikazu KIHARA
Assignee (at issue)
OKI ELECTRIC INDUSTRY CO., LTD.
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.