Granted Patent
Utility
US 6,442,273 · App. 09/508,583
Echo canceller and echo cancelling method
Inventor:
Kozo Okuda
Patented Case
View Patent ↗
Granted: Aug 27, 2002
Filed: Mar 14, 2000
Inventor
Kozo Okuda
Assignee (at issue)
SANYO ELECTRIC 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.