Granted Patent
Utility
US 4,425,483 · App. 06/310,501
Echo cancellation using transversal filters
Inventors:
Pok F. Lee, John A. Bond
Patented Case
View Patent ↗
Granted: Jan 10, 1984
Filed: Oct 13, 1981
Inventors
Pok F. Lee
John A. Bond
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.