Granted Patent
Utility
US 5,610,909 · App. 08/455,385
Multistage echo canceler including time variation compensation
Inventor:
David G. Shaw
Patented Case
View Patent ↗
Granted: Mar 11, 1997
Filed: May 31, 1995
Inventor
David G. Shaw
Assignee (at issue)
LUCENT TECHNOLOGIES INC.
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.