Granted Patent
Utility
US 5,666,407 · App. 08/567,521
Software-based bridging system for full duplex audio telephone conferencing
Inventor:
Randy D. Pfeifer
Patented Case
View Patent ↗
Granted: Sep 9, 1997
Filed: Dec 5, 1995
Inventor
Randy D. Pfeifer
Assignee (at issue)
NCR 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.