Granted Patent
Utility
US 6,236,725 · App. 09/056,000
Echo canceler employing multiple step gains
Inventors:
Masashi Takada, Yoshihiro Ariyama
Patented Case
View Patent ↗
Granted: May 22, 2001
Filed: Apr 7, 1998
Inventors
Masashi Takada
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.