Granted Patent
Utility
US 6,683,961 · App. 09/946,459
Process and apparatus for eliminating loudspeaker interference from microphone signals
Inventor:
Dietmar Ruwisch
Patented Case
View Patent ↗
Granted: Jan 27, 2004
Filed: Sep 4, 2001
Inventor
Dietmar Ruwisch
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.