Granted Patent
Utility
US 4,414,621 · App. 06/314,407
Interactive visual communications system
Inventors:
Herbert G. Bown, C. Douglas O'Brien
Patented Case
View Patent ↗
Granted: Nov 8, 1983
Filed: Oct 23, 1981
Inventors
Herbert G. Bown
C. Douglas O'Brien
Assignee (at issue)
Canadian Patents and Development Limited
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.