Granted Patent
Utility
US 6,807,423 · App. 09/460,780
Communication and presence spanning multiple access networks
Inventors:
Steven M. Armstrong, Eric Parsons, Elwyn B Davies, Andrew Newton Harker, David Robert Stringer
Patented Case
View Patent ↗
Granted: Oct 19, 2004
Filed: Dec 14, 1999
Inventors
Steven M. Armstrong
Eric Parsons
Elwyn B Davies
Andrew Newton Harker
David Robert Stringer
Assignee (at issue)
Nortel Networks 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.