Granted Patent
Utility
US 5,796,811 · App. 08/613,025
Three way call detection
Inventor:
John D. McFarlen
Patented Case
View Patent ↗
Granted: Aug 18, 1998
Filed: Mar 11, 1996
Inventor
John D. McFarlen
Assignee (at issue)
Gateway Technologies, Inc.
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.