Granted Patent
Utility
US 6,421,443 · App. 09/360,211
Acoustic and electronic echo cancellation
Inventors:
Kendall G. Moore, Samuel L. Thomasson
Patented Case
View Patent ↗
Granted: Jul 16, 2002
Filed: Jul 23, 1999
Inventors
Kendall G. Moore
Samuel L. Thomasson
Assignee (at issue)
Acoustic 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.