Granted Patent
Utility
US 6,590,975 · App. 09/408,952
Echo canceller
Inventor:
Yoshihiro Ariyama
Patented Case
View Patent ↗
Granted: Jul 8, 2003
Filed: Sep 30, 1999
Inventor
Yoshihiro Ariyama
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.