Granted Patent
Utility
US 4,609,787 · App. 06/612,159
Echo canceller with extended frequency range
Inventor:
Otakar A. Horna
Patented Case
View Patent ↗
Granted: Sep 2, 1986
Filed: May 21, 1984
Inventor
Otakar A. Horna
Assignee (at issue)
Communications Satellite 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.