Granted Patent
Utility
US 4,360,712 · App. 06/072,813
Double talk detector for echo cancellers
Inventor:
Otakar A. Horna
Patented Case
View Patent ↗
Granted: Nov 23, 1982
Filed: Sep 5, 1979
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.