Granted Patent
Utility
US 4,271,502 · App. 06/050,030
Digital voice conferencer
Inventors:
Michel M. H. Goutmann, Robert Harper
Patented Case
View Patent ↗
Granted: Jun 2, 1981
Filed: Jun 19, 1979
Inventors
Michel M. H. Goutmann
Robert Harper
Assignee (at issue)
Magnavox Government and Industrial Electronics Company
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.