Granted Patent
Utility
US 5,473,686 · App. 08/190,775
Echo cancellation apparatus
Inventor:
Harbhajan S. Virdee
Patented Case
View Patent ↗
Granted: Dec 5, 1995
Filed: Feb 1, 1994
Inventor
Harbhajan S. Virdee
Assignee (at issue)
Tandy Corporation
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.