Granted Patent
Utility
US 5,805,685 · App. 08/558,155
Three way call detection by counting signal characteristics
Inventor:
John D. McFarlen
Patented Case
View Patent ↗
Granted: Sep 8, 1998
Filed: Nov 15, 1995
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.