Granted Patent
Utility
US 4,215,252 · App. 05/946,298
Video teleconference audio echo control unit
Inventor:
Michael Onufry, Jr.
Patented Case
View Patent ↗
Granted: Jul 29, 1980
Filed: Sep 27, 1978
Inventor
Michael Onufry, Jr.
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.