Granted Patent
Utility
US 4,293,946 · App. 06/096,599
Trilateral duplex path conferencing system with broadcast capability
Inventors:
Michael L. Kuras, Daniel C. Upp, Herbert J. Toegel
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: Nov 21, 1979
Inventors
Michael L. Kuras
Daniel C. Upp
Herbert J. Toegel
Assignee (at issue)
International Telephone and Telegraph 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.