Granted Patent
Utility
US 6,178,162 · App. 08/994,456
Method and apparatus for inhibiting echo in a channel of a communication system
Inventors:
David Dal Farra, Heping Ding
Patented Case
View Patent ↗
Granted: Jan 23, 2001
Filed: Dec 19, 1997
Inventors
David Dal Farra
Heping Ding
Assignee (at issue)
Nortel Networks Limited
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.